Document:

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                                                                     EXHIBIT 4.5

        CONVERTIBLE PREFERRED STOCK PURCHASE AGREEMENT (this "Agreement"), dated
as of October 5, 2000, among e.Digital Corporation., a Delaware corporation (the
"Company"), and the investors signatory hereto (each such investor is a
"Purchaser" and all such investors are, collectively, the "Purchasers").

        WHEREAS, subject to the terms and conditions set forth in this Agreement
and pursuant to Section 4(2) of the Securities Act of 1933 (the "Securities
Act"), as amended, the Company desires to issue and sell to the Purchasers and
the Purchasers, severally and not jointly, desire to purchase from the Company
(i) shares of the Company's 7% Series C Convertible Preferred Stock, par value
$.001 per share (the "Preferred Stock"), which are convertible into shares of
the Company's common stock, par value $.001 per share (the "Common Stock"), and
(ii) certain other securities of the Company as more fully described in this
Agreement.

        NOW, THEREFORE, IN CONSIDERATION of the mutual covenants contained in
this Agreement, and for other good and valuable consideration the receipt and
adequacy of which are hereby acknowledged, the Company and the Purchasers agree
as follows:

                                    ARTICLE I
                                PURCHASE AND SALE

        1.1 The Closing.

               (a) The Closing (i) Subject to the terms and conditions set forth
in this Agreement the Company shall issue and sell to the Purchasers and the
Purchasers shall, severally and not jointly, purchase an aggregate of 400 shares
of Preferred Stock ("Shares") and certain Common Stock purchase warrants as
described below in this Section for an aggregate purchase price of $4,000,000.
The closing of the purchase and sale of such securities (the "Closing") shall
take place at the offices of Robinson Silverman Pearce Aronsohn & Berman LLP
("Robinson Silverman"), 1290 Avenue of the Americas, New York, New York 10104,
immediately following the execution hereof or such later date as the parties
shall agree. The date of the Closing is hereinafter referred to as the "Closing
Date."

               (ii) At the Closing, the parties shall deliver or shall cause to
be delivered the following: (A) the Company shall deliver to each Purchaser (1)
a stock certificate registered in the name of such Purchaser, representing a
number of Shares equal to the quotient obtained by dividing the purchase price
indicated below such Purchaser's name on the signature page to this Agreement by
10,000, (2) a Common Stock purchase warrant, in the form of Exhibit C-1,
registered in the name of such Purchaser, pursuant to which such Purchaser shall
have the right to acquire the number of Warrant Shares (as defined in the
Warrant) indicated below such Purchaser's name on the signature page to this
Agreement (collectively, the "Closing Warrants"), (3) a Common Stock purchase
warrant, in the form of Exhibit C-2, registered in the name of such Purchaser,
pursuant to which, such Purchaser shall have the right to acquire shares of
Common Stock pursuant to the terms thereof (collectively, the "Vesting
Warrants", and together with the Closing Warrants, the "Warrants"),(3) the legal
opinion of Higham, McConnell& Dunning LLP, outside counsel to the Company in the
form of Exhibit D, (4) an

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executed copy of this Agreement and an executed Registration Rights Agreement,
dated as of the date hereof, among the Company and the Purchasers, in the form
of Exhibit B (the "Registration Rights Agreement"), and (5) Transfer Agent
Instructions, in the form of Exhibit E, executed by the Company and delivered to
and acknowledged by the Company's transfer agent (the "Transfer Agent
Instructions"); and (B) each Purchaser shall deliver (1) the purchase price
indicated below such Purchaser's name on the signature page to this Agreement in
United States dollars in immediately available funds by wire transfer to an
account designated in writing by the Company for such purpose, and (2) an
executed copy of this Agreement and Registration Rights Agreement.

               1.2 Terms of Preferred Stock. The Preferred Stock shall have the
rights preferences and privileges set forth in Exhibit A, and shall be
incorporated into a Certificate of Designation (the "Certificate of
Designation") to be filed prior to the Closing by the Company with the Secretary
of State of Delaware, in form and substance mutually agreed to by the parties.

               1.3 Certain Defined Terms. For purposes of this Agreement,
"Original Issue Date" and "Trading Day" shall have the meanings set forth in
Exhibit A and "Business Day" shall mean any day except Saturday, Sunday and any
day which shall be a federal legal holiday or a day on which banking
institutions in the State of New York or the State of California are authorized
or required by law or other governmental action to close. A "Person" means an
individual or corporation, partnership, trust, incorporated or unincorporated
association, joint venture, limited liability company, joint stock company,
government (or an agency or subdivision thereof) or other entity of any kind.

                                   ARTICLE II
                         REPRESENTATIONS AND WARRANTIES

        2.1 Representations and Warranties of the Company. The Company hereby
makes the following representations and warranties to the Purchasers:

               (a) Organization and Qualification. The Company is a corporation
duly incorporated, validly existing and in good standing under the laws of the
State of Delaware, with the requisite corporate power and authority to own and
use its properties and assets and to carry on its business as currently
conducted. The Company has no subsidiaries other than as set forth in Schedule
2.1(a) (collectively, the "Subsidiaries"). Each of the Subsidiaries is an
entity, duly incorporated or otherwise organized, validly existing and in good
standing under the laws of the jurisdiction of its incorporation or organization
(as applicable), with the requisite power and authority to own and use its
properties and assets and to carry on its business as currently conducted. Each
of the Company and the Subsidiaries is duly qualified to do business and is in
good standing as a foreign corporation or other entity in each jurisdiction in
which the nature of the business conducted or property owned by it makes such
qualification necessary, except where the failure to be so qualified or in good
standing, as the case may be, could not, individually or in the aggregate, (x)
adversely affect the legality, validity or enforceability of the

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Securities (as defined below) or any of this Agreement, the Registration Rights
Agreement, the Certificate of Designation, the Transfer Agent Instructions or
the Warrants (collectively, the "Transaction Documents"), (y) have or result in
a material adverse effect on the results of operations, assets, prospects, or
condition (financial or otherwise) of the Company and the Subsidiaries, taken as
a whole, or (z) adversely impair the Company's ability to perform fully on a
timely basis its obligations under any of the Transaction Documents (any of (x),
(y) or (z), a "Material Adverse Effect").

               (b) Authorization; Enforcement. The Company has the requisite
corporate power and authority to enter into and to consummate the transactions
contemplated by each of the Transaction Documents and otherwise to carry out its
obligations thereunder. The execution and delivery of each of the Transaction
Documents by the Company and the consummation by it of the transactions
contemplated thereby have been duly authorized by all necessary action on the
part of the Company and no further action is required by the Company. Each of
the Transaction Documents has been duly executed by the Company and, when
delivered (or filed, as the case may be) in accordance with the terms hereof,
will constitute the valid and binding obligation of the Company enforceable
against the Company in accordance with its terms. Neither the Company nor any
Subsidiary is in violation of any of the provisions of its respective
certificate or articles of incorporation, by-laws or other organizational or
charter documents.

               (c) Capitalization. The number of authorized, issued and
outstanding capital stock of the Company is set forth in Schedule 2.1(c). Except
as disclosed in Schedule 2.1(c), the Company owns all of the capital stock of
each Subsidiary. No shares of Common Stock are entitled to preemptive or similar
rights, nor is any holder of the securities of the Company or any Subsidiary
entitled to preemptive or similar rights arising out of any agreement or
understanding with the Company or any Subsidiary by virtue of any of the
Transaction Documents. Except as a result of the purchase and sale of the Shares
and the Warrants and except as disclosed in Schedule 2.1(c), there are no
outstanding options, warrants, script rights to subscribe to, calls or
commitments of any character whatsoever relating to, or securities, rights or
obligations convertible into or exchangeable for, or giving any Person any right
to subscribe for or acquire, any shares of Common Stock, or contracts,
commitments, understandings, or arrangements by which the Company or any
Subsidiary is or may become bound to issue additional shares of Common Stock, or
securities or rights convertible or exchangeable into shares of Common Stock.
The issue and sale of the Shares, Warrants or Underlying Shares (as hereinafter
defined) will not obligate the Company to issue shares of Common Stock or other
securities to any Person other than the Purchaser and will not result in a right
of any holder of Company's securities to adjust the exercise or conversion or
reset price under such securities.

               (d) Issuance of the Shares and the Warrants. The Shares and the
Warrants are duly authorized and, when issued and paid for in accordance with
the terms hereof, will be duly and validly issued, fully paid and nonassessable,
free and clear of all liens, encumbrances and rights of first refusal of any
kind (collectively, "Liens"). The Company has on the date hereof and will, at
all times while the Shares and the Warrants are outstanding, maintain an
adequate reserve of duly authorized shares of Common Stock, reserved for
issuance to the holders of the

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Shares and the Warrants, to enable it to perform its conversion, exercise and
other obligations under this Agreement, the Certificate of Designation and the
Warrants. As of the date hereof, the Company has reserved for issuance the sum
of 369,514 Warrant Shares and 3,333,333 shares of Common Stock for issuance upon
conversion of Shares and payment of dividends thereon in shares of Common Stock
(the "Initial Minimum"). All such authorized shares of Common Stock shall be
duly reserved for issuance to the holders of the Shares and the Warrants. The
shares of Common Stock issuable upon conversion of the Shares and upon exercise
of the Warrants are collectively referred to herein as the "Underlying Shares."
The Shares, the Warrants and the Underlying Shares are collectively referred to
herein as, the "Securities." When issued in accordance with the Certificate of
Designation and the Warrants, the Underlying Shares will be duly authorized,
validly issued, fully paid and nonassessable, free and clear of all Liens.

               (e) No Conflicts. The execution, delivery and performance of the
Transaction Documents by the Company and the consummation by the Company of the
transactions contemplated thereby do not and will not (i) conflict with or
violate any provision of the Company's or any Subsidiary's certificate or
articles of incorporation, bylaws or other charter documents (each as amended
through the date hereof), or (ii) subject to obtaining the Required Approvals
(as defined below), conflict with, or constitute a default (or an event which
with notice or lapse of time or both would become a default) under, or give to
others any rights of termination, amendment, acceleration or cancellation (with
or without notice, lapse of time or both) of, any agreement, credit facility,
debt or other instrument or other understanding to which the Company or any
Subsidiary is a party or by which any property or asset of the Company or any
Subsidiary is bound or affected, or (iii) result in a violation of any law,
rule, regulation, order, judgment, injunction, decree or other restriction of
any court or governmental authority to which the Company or a Subsidiary is
subject (including federal and state securities laws and regulations), or by
which any property or asset of the Company or a Subsidiary is bound or affected;
except in the case of each of clauses (ii) and (iii), as could not, individually
or in the aggregate, have or result in a Material Adverse Effect. The business
of the Company is not being conducted in violation of any law, ordinance or
regulation of any governmental authority, except for violations which,
individually or in the aggregate, could not have or result in a Material Adverse
Effect.

               (f) Filings, Consents and Approvals. Neither the Company nor any
Subsidiary is required to obtain any consent, waiver, authorization or order of,
give any notice to, or make any filing or registration with, any court or other
federal, state, local or other governmental authority or other Person in
connection with the execution, delivery and performance by the Company of the
Transaction Documents, other than (i) the filing of the Certificate of
Designation with the Secretary of State of Delaware, (ii) the filings required
pursuant to Section 3.9, (iii) the filing with the Securities and Exchange
Commission (the "Commission") of a registration statement meeting the
requirements set forth in the Registration Rights Agreement and covering the
resale of the Underlying Shares by the Purchasers (the "Underlying Shares
Registration Statement"), (iv) applicable Blue Sky filings, and (v) in all other
cases where the failure to obtain such consent, waiver, authorization or order,
or to give

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such notice or make such filing or registration could not have or result in,
individually or in the aggregate, a Material Adverse Effect (collectively, the
"Required Approvals").

               (g) Litigation; Proceedings. There is no action, suit, inquiry,
notice of violation, proceeding or investigation pending or, to the knowledge of
the Company, threatened against or affecting the Company or any of its
Subsidiaries or any of their respective properties before or by any court,
arbitrator, governmental or administrative agency or regulatory authority
(federal, state, county, local or foreign) (collectively, an "Action") which (i)
adversely affects or challenges the legality, validity or enforceability of any
of the Transaction Documents or the Securities or (ii) could, if there were an
unfavorable decision, individually or in the aggregate, have or result in a
Material Adverse Effect. Except as described in the SEC Documents, (i) neither
the Company nor any Subsidiary, nor any director or officer thereof, is or has
been the subject of any Action involving (A) a claim of violation of or
liability under federal or state securities laws or (B) a claim of breach of
fiduciary duty; (ii) the Company does not have pending before the Commission any
request for confidential treatment of information and the Company has no
knowledge of any expected such request that would be made prior to the
Effectiveness Date (as defined in the Registration Rights Agreement); and (iii)
there has not been, and to the best of the Company's knowledge there is not
pending or contemplated, any investigation by the Commission involving the
Company or any current or former director or officer of the Company.

               (h) No Default or Violation. Neither the Company nor any
Subsidiary (i) is in default under or in violation of (and no event has occurred
which has not been waived which, with notice or lapse of time or both, would
result in a default by the Company or any Subsidiary under), nor has the Company
or any Subsidiary received notice of a claim that it is in default under or that
it is in violation of, any indenture, loan or credit agreement or any other
agreement or instrument to which it is a party or by which it or any of its
properties is bound, (ii) is in violation of any order of any court, arbitrator
or governmental body, or (iii) is in violation of any statute, rule or
regulation of any governmental authority, in each case of clauses (i), (ii) or
(iii) above, except as could not individually or in the aggregate, have or
result in a Material Adverse Effect.

               (i) Private Offering. Assuming the accuracy of the
representations and warranties of the Purchasers set forth in Sections
2.2(b)-(g), the offer, issuance and sale of the Securities to the Purchasers as
contemplated hereby are exempt from the registration requirements of the
Securities Act. Neither the Company nor, to its knowledge, any Person acting on
its behalf has taken or is contemplating taking any action which could subject
the offering, issuance or sale of the Securities to the registration
requirements of the Securities Act including soliciting any offer to buy or sell
the Securities by means of any form of general solicitation or advertising.

               (j) SEC Documents; Financial Statements. The Company has filed
all reports required to be filed by it under the Securities Exchange Act of
1934, as amended (the "Exchange Act"), including pursuant to Section 13(a) or
15(d) thereof, for the two years preceding the date

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hereof (or such shorter period as the Company was required by law to file such
material) (the foregoing materials being collectively referred to herein as the
"SEC Documents" and, together with the Schedules to this Agreement, the
"Disclosure Materials") on a timely basis or has received a valid extension of
such time of filing and has filed any such SEC Documents prior to the expiration
of any such extension. As of their respective dates, the SEC Documents complied
in all material respects with the requirements of the Securities Act and the
Exchange Act and the rules and regulations of the Commission promulgated
thereunder, and none of the SEC Documents, when filed, contained any untrue
statement of a material fact or omitted to state a material fact required to be
stated therein or necessary in order to make the statements therein, in light of
the circumstances under which they were made, not misleading. All material
agreements to which the Company is a party or to which the property or assets of
the Company are subject have been filed as exhibits to the SEC Documents as
required under the Exchange Act. The financial statements of the Company
included in the SEC Documents comply in all material respects with applicable
accounting requirements and the rules and regulations of the Commission with
respect thereto as in effect at the time of filing. Such financial statements
have been prepared in accordance with generally accepted accounting principles
applied on a consistent basis during the periods involved ("GAAP"), except as
may be otherwise specified in such financial statements or the notes thereto,
and fairly present in all material respects the financial position of the
Company and its consolidated subsidiaries as of and for the dates thereof and
the results of operations and cash flows for the periods then ended, subject, in
the case of unaudited statements, to normal, immaterial, year-end audit
adjustments. Since June 30, 2000, except as specifically disclosed in the SEC
Documents, (a) there has been no event, occurrence or development that has or
that could result in a Material Adverse Effect, (b) the Company has not incurred
any liabilities (contingent or otherwise) other than (x) liabilities incurred in
the ordinary course of business consistent with past practice and (y)
liabilities not required to be reflected in the Company's financial statements
pursuant to GAAP or otherwise required to be disclosed in filings made with the
Commission, (c) the Company has not altered its method of accounting or the
identity of its auditors and (d) the Company has not declared or made any
payment or distribution of cash or other property to its stockholders or
officers or directors (other than in compliance with existing Company stock
option plans) with respect to its capital stock, or purchased, redeemed (or made
any agreements to purchase or redeem) any shares of its capital stock.

               (k) Investment Company. The Company is not, and is not an
Affiliate (as defined in Rule 405 under the Securities Act) of, an "investment
company" within the meaning of the Investment Company Act of 1940, as amended.

               (l) Certain Fees. Except for certain fees payable to Jessup &
Lamont Securities Corp. by the Company, no fees or commissions will be payable
by the Company to any broker, financial advisor or consultant, finder, placement
agent, investment banker, bank or other similar Person with respect to the
transactions contemplated by this Agreement. The Purchasers shall have no
obligation with respect to any fees or with respect to any claims made by or on
behalf of other Persons for fees of a type contemplated in this Section that may
be due in connection with the transactions contemplated by this Agreement. The
Company shall

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indemnify and hold harmless the Purchasers, their employees, officers,
directors, agents, and partners, and their respective Affiliates, from and
against all claims, losses, damages, costs (including the costs of preparation
and attorney's fees) and expenses suffered in respect of any such claimed or
existing fees, as such fees and expenses are incurred.

               (m) Form S-3 Eligibility. The Company is eligible to register
securities for resale with the Commission under Form S-3 promulgated under the
Securities Act. The "Public Float" of the Common Stock is [ ] on the date
hereof.

               (n) Seniority. No outstanding class of equity securities of the
Company is senior to the Shares in right of payment, whether upon liquidation or
dissolution, or otherwise.

               (o) Listing and Maintenance Requirements. Except as set forth in
the SEC Documents, the Company has not, in the two years preceding the date
hereof received notice (written or oral) from the OTC, any stock exchange,
market or trading facility on which the Common Stock is or has been listed (or
on which it has been quoted) to the effect that the Company is not in compliance
with the listing or maintenance requirements of such exchange, market or trading
facility. The Company is, and has no reason to believe that it will not in the
foreseeable future continue to be, in compliance with all such listing and
maintenance requirements.

               (p) Patents and Trademarks. The Company and its Subsidiaries
have, or have rights to use, all patents, patent applications, trademarks,
trademark applications, service marks, trade names, copyrights, licenses and
rights which are necessary or material for use in connection with their
respective businesses as described in the SEC Documents and which the failure to
so have would have a Material Adverse Effect (collectively, the "Intellectual
Property Rights"). To the best knowledge of the Company, neither the Company nor
any Subsidiary has received a written notice that the Intellectual Property
Rights used by the Company or its Subsidiaries violates or infringes upon the
rights of any Person. Except as specified in Schedule 2.1(p), to the best
knowledge of the Company, all such Intellectual Property Rights are enforceable
and there is no existing infringement by another Person of any of the
Intellectual Property Rights.

               (q) Registration Rights; Rights of Participation. Except as
disclosed in Section 6(c) of the Registration Rights Agreement, the Company has
not granted or agreed to grant to any Person any rights (including "piggy-back"
registration rights) to have any securities of the Company registered with the
Commission or any other governmental authority which have not been satisfied. No
Person, has any right of first refusal, preemptive right, right of
participation, or any similar right to participate in the transactions
contemplated by the Transaction Documents.

               (r) Regulatory Permits. The Company and its Subsidiaries possess
all certificates, authorizations and permits issued by the appropriate federal,
state or foreign regulatory authorities necessary to conduct their respective
businesses as described in the SEC Documents, except where the failure to
possess such permits could not, individually or in the aggregate, have or result
in a Material Adverse Effect ("Material Permits"), and neither the

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Company nor any such Subsidiary has received any notice of proceedings relating
to the revocation or modification of any Material Permit.

               (s) Title. The Company and the Subsidiaries have good and
marketable title to all personal property owned by them which is material to the
business of the Company and its Subsidiaries, in each case free and clear of all
Liens, except for Liens as do not materially affect the value of such property
and do not interfere with the use made and proposed to be made of such property
by the Company and its Subsidiaries. Any real property and facilities held under
lease by the Company and its Subsidiaries are held by them under valid,
subsisting and enforceable leases of which the Company and its Subsidiaries are
in compliance and do not interfere with the use made and proposed to be made of
such property and buildings by the Company and its Subsidiaries.

               (t) Labor Relations. No material labor problem exists or, to the
knowledge of the Company, is imminent with respect to any of the employees of
the Company.

               (u) Shareholders Rights Plan. Neither the consummation of the
transactions contemplated hereby nor the issuance of the Underlying Shares will
cause the Purchasers to be deemed an "Acquiring Person" under any existing or
hereafter adopted shareholders rights plan or similar arrangement.

               (v) Disclosure. The Company confirms that neither it nor any
other Person acting on its behalf has provided any of the Purchasers or its
agents or counsel with any information that constitutes or might constitute
material non-public information. The Company understands and confirms that the
Purchasers shall be relying on the foregoing representations in effecting
transactions in securities of the Company. All disclosure provided to the
Purchasers regarding the Company, its business and the transactions contemplated
hereby, including the Schedules to this Agreement, furnished by or on behalf of
the Company are true and correct and do not contain any untrue statement of a
material fact or omit to state any material fact necessary in order to make the
statements made therein, in light of the circumstances under which they were
made, not misleading.

        2.2 Representations and Warranties of the Purchasers. Each Purchaser
hereby for itself and for no other Purchaser represents and warrants to the
Company as follows:

               (a) Organization; Authority. Such Purchaser is an entity duly
organized, validly existing and in good standing under the laws of the
jurisdiction of its organization with the requisite corporate or partnership
power and authority to enter into and to consummate the transactions
contemplated by the Transaction Documents and otherwise to carry out its
obligations thereunder. The purchase by such Purchaser of the Securities
hereunder has been duly authorized by all necessary action on the part of such
Purchaser. Each of this Agreement and the Registration Rights Agreement has been
duly executed by such Purchaser, and when delivered by such Purchaser in
accordance with the terms hereof, will constitute the valid and legally binding
obligation of such Purchaser, enforceable against it in accordance with its
terms.

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               (b) Investment Intent. Such Purchaser is acquiring the Securities
as principal for its own account for investment purposes only and not with a
view to or for distributing or reselling such Securities or any part thereof,
without prejudice, however, to such Purchaser's right, subject to the provisions
of this Agreement, the Registration Rights Agreement and the Warrants, at all
times to sell or otherwise dispose of all or any part of such Securities
pursuant to an effective registration statement under the Securities Act or
under an exemption from such registration and in compliance with applicable
federal and state securities laws. Nothing contained herein shall be deemed a
representation or warranty by such Purchaser to hold Securities for any period
of time. Such Purchaser is acquiring the Securities hereunder in the ordinary
course of its business. Such Purchaser does not have any agreement or
understanding, directly or indirectly, with any Person to distribute the
Securities.

               (c) Purchaser Status. At the time such Purchaser was offered the
Securities, it was, and at the date hereof it is, and at each exercise date
under its respective Warrants, it will be, an "accredited investor" as defined
in Rule 501(a) under the Securities Act.

               (d) Experience of such Purchaser. Such Purchaser, either alone or
together with its representatives, has such knowledge, sophistication and
experience in business and financial matters so as to be capable of evaluating
the merits and risks of the prospective investment in the Securities, and has so
evaluated the merits and risks of such investment.

               (e) Ability of such Purchaser to Bear Risk of Investment. Such
Purchaser is able to bear the economic risk of an investment in the Securities
and, at the present time, is able to afford a complete loss of such investment.

               (f) Access to Information. Such Purchaser acknowledges that it
has reviewed the Disclosure Materials and has been afforded (i) the opportunity
to ask such questions as it has deemed necessary of, and to receive answers
from, representatives of the Company concerning the terms and conditions of the
offering of the Securities and the merits and risks of investing in the
Securities; (ii) access to information about the Company and the Company's
financial condition, results of operations, business, properties, management and
prospects sufficient to enable it to evaluate its investment; and (iii) the
opportunity to obtain such additional information which the Company possesses or
can acquire without unreasonable effort or expense that is necessary to make an
informed investment decision with respect to the investment and to verify the
accuracy and completeness of the information contained in the Disclosure
Materials. Neither such inquiries nor any other investigation conducted by or on
behalf of such Purchaser or its representatives or counsel shall modify, amend
or affect such Purchaser's right to rely on the truth, accuracy and completeness
of the Disclosure Materials and the Company's representations and warranties
contained in the Transaction Documents.

               (g) General Solicitation. Such Purchaser is not purchasing the
Securities as a result of or subsequent to any advertisement, article, notice or
other communication regarding the Securities published in any newspaper,
magazine or similar media or broadcast over television or radio or presented at
any seminar or any other general solicitation or general advertisement.

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               (h) Reliance. Such Purchaser understands and acknowledges that
(i) the Securities are being offered and sold to it without registration under
the Securities Act in a private placement that is exempt from the registration
provisions of the Securities Act and (ii) the availability of such exemption,
depends in part on, and the Company will rely upon the accuracy and truthfulness
of, the foregoing representations and such Purchaser hereby consents to such
reliance.

               The Company acknowledges and agrees that no Purchaser makes or
has made any representations or warranties with respect to the transactions
contemplated hereby other than those specifically set forth in this Section 2.2.

                                   ARTICLE III
                         OTHER AGREEMENTS OF THE PARTIES

        3.1 Transfer Restrictions. (a) Securities may only be disposed of
pursuant to an effective registration statement under the Securities Act, to the
Company or pursuant to an available exemption from or in a transaction not
subject to the registration requirements of the Securities Act, and in
compliance with any applicable federal and state securities laws. In connection
with any transfer of Securities other than pursuant to an effective registration
statement or to the Company, except as otherwise set forth herein, the Company
may require the transferor thereof to provide to the Company an opinion of
counsel selected by the transferor, the form and substance of which opinion
shall be reasonably satisfactory to the Company, to the effect that such
transfer does not require registration of such transferred Securities under the
Securities Act. Any such transferee shall agree in writing to be bound by the
terms of this Agreement and shall have the rights of a Purchaser under this
Agreement and the Registration Rights Agreement.

               (b) The Purchasers agree to the imprinting, so long as is
required by this Section 3.1(b), of the following legend on the Securities:

                NEITHER THESE SECURITIES [NOR THE SECURITIES INTO WHICH THESE
        SECURITIES ARE [CONVERTIBLE] [EXERCISABLE] HAVE BEEN REGISTERED WITH THE
        SECURITIES AND EXCHANGE COMMISSION OR THE SECURITIES COMMISSION OF ANY
        STATE IN RELIANCE UPON AN EXEMPTION FROM REGISTRATION UNDER THE
        SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"), AND,
        ACCORDINGLY, MAY NOT BE OFFERED OR SOLD EXCEPT PURSUANT TO AN EFFECTIVE
        REGISTRATION STATEMENT UNDER THE SECURITIES ACT OR PURSUANT TO AN
        AVAILABLE EXEMPTION FROM, OR IN A TRANSACTION NOT SUBJECT TO, THE
        REGISTRATION REQUIREMENTS OF THE SECURITIES ACT AND IN ACCORDANCE WITH
        APPLICABLE STATE SECURITIES LAWS.

               Underlying Shares shall not contain the legend set forth above
nor any other legend at any time while an Underlying Shares Registration
Statement is effective under the

                                      -10-
<PAGE>   11

Securities Act or, in the event there is not an effective Underlying Shares
Registration Statement, at such time as in the opinion of counsel to the
Company, such legend is not required under applicable requirements of the
Securities Act (including judicial interpretations and pronouncements issued by
the staff of the Commission). The Company shall cause its counsel to issue the
legal opinion included in the Transfer Agent Instructions to the Company's
transfer agent on the day that the Underlying Shares Registration Statement is
declared effective by the Commission. The Company agrees that, in the event any
Underlying Shares are issued with a legend in accordance with this Section
3.1(b), it will, within three (3) Trading Days after request therefor by a
Purchaser, provide such Purchaser with a certificate or certificates
representing such Underlying Shares, free from such legend at such time as such
legend would not have been required under this Section 3.1(b) had such issuance
occurred on the date of such request. The Company may not make any notation on
its records or give instructions to any transfer agent of the Company which
enlarge the restrictions of transfer set forth in this Section.

        3.2 Acknowledgment of Dilution. The Company acknowledges that the
issuance of the Underlying Shares upon (i) conversion of the Shares in
accordance with the terms of the Certificate of Designation, and (ii) exercise
of the Warrants in accordance with their terms, will result in dilution of the
outstanding shares of Common Stock, which dilution may be substantial under
certain market conditions. The Company further acknowledges that its obligation
to issue Underlying Shares upon (x) conversion of the Shares in accordance with
the terms of the Certificate of Designation, and (y) exercise of the Warrants in
accordance with their terms, is unconditional and absolute, subject to the
limitations set forth herein, in the Certificate of Designation or pursuant to
the Warrants, regardless of the effect of any such dilution.

        3.3 Furnishing of Information. As long as the Purchasers own Securities,
the Company covenants to timely file (or obtain extensions in respect thereof
and file within the applicable grace period) all reports required to be filed by
the Company after the date hereof pursuant to Section 13(a) or 15(d) of the
Exchange Act. As long as the Purchasers own Securities, if the Company is not
required to file reports pursuant to such sections, it will prepare and furnish
to the Purchasers and make publicly available in accordance with Rule 144(c)
promulgated under the Securities Act such information as is required for the
Purchasers to sell the Securities under Rule 144 promulgated under the
Securities Act. The Company further covenants that it will take such further
action as any holder of Securities may reasonably request, all to the extent
required from time to time to enable such Person to sell Underlying Shares
without registration under the Securities Act within the limitation of the
exemptions provided by Rule 144 promulgated under the Securities Act, including
causing its attorneys to render and deliver any legal opinion required in order
to permit a Purchaser to receive Underlying Shares free of all restrictive
legends and to subsequently sell Underlying Shares under Rule 144 upon receipt
of a notice of an intention to sell or other form of notice having a similar
effect. Upon the request of any such Person, the Company shall deliver to such
Person a written certification of a duly authorized officer as to whether it has
complied with such requirements.

        3.4 Integration. The Company shall not, and shall use its best efforts
to ensure that, no Affiliate of the Company shall, sell, offer for sale or
solicit offers to buy or otherwise

                                      -11-
<PAGE>   12

negotiate in respect of any security (as defined in Section 2 of the Securities
Act) that would be integrated with the offer or sale of the Securities in a
manner that would require the registration under the Securities Act of the sale
of the Securities to the Purchasers.

        3.5 Increase in Authorized Shares. If on any date the Company would be,
if a notice of conversion or exercise (as the case may be) were to be delivered
on such date, precluded from issuing (a) the number of Underlying Shares as
would then be issuable upon a conversion in full of the Shares, and (b) of the
number of Underlying Shares as would then be issuable upon exercise of the
Warrants (the "Current Required Minimum"), in either case, due to the
unavailability of a sufficient number of authorized but unissued or reserved
shares of Common Stock, then the Board of Directors of the Company shall
promptly prepare and mail to the stockholders of the Company proxy materials
requesting authorization to amend the Company's certificate or articles of
incorporation to increase the number of shares of Common Stock which the Company
is authorized to issue to at least such number of shares as reasonably requested
by the Purchasers in order to provide for such number of authorized and unissued
shares of Common Stock to enable the Company to comply with its issuance,
conversion, exercise and reservation of shares obligations as set forth in this
Agreement, the Certificate of Designation and the Warrants (the sum of (x) the
number of shares of Common Stock then outstanding plus all shares of Common
Stock issuable upon exercise of all outstanding options, warrants and
convertible instruments, and (y) the Current Required Minimum, shall be a
reasonable number). In connection therewith, the Board of Directors shall (a)
adopt proper resolutions authorizing such increase, (b) recommend to and
otherwise use its best efforts to promptly and duly obtain stockholder approval
to carry out such resolutions (and hold a special meeting of the stockholders no
later than the earlier to occur of the 60th day after delivery of the proxy
materials relating to such meeting and the 90th day after request by a holder of
Securities to issue the number of Underlying Shares in accordance with the terms
hereof) and (c) within five Business Days of obtaining such stockholder
authorization, file an appropriate amendment to the Company's certificate or
articles of incorporation to evidence such increase.

        3.6 Reservation and Listing of Underlying Shares. (a) If, after the date
hereof, the Company shall list the Common Stock on any of the New York Stock
Exchange, American Stock Exchange, Nasdaq National Market or Nasdaq SmallCap
Market (each, a "Subsequent Market"), then the Company shall include in such
listing for the benefit of the Purchasers for issuance upon exercise of the
Warrants and conversion of the Shares a number of shares of Common Stock equal
to not less than the then Current Required Minimum. If the number of Underlying
Shares issuable upon conversion in full of the then outstanding Shares, as
payment of dividends thereon, and upon exercise of the then unexercised portion
of the Warrants exceed the number of Underlying Shares previously listed on
account thereof with a Subsequent Market, then the Company shall take the
necessary actions to immediately list a number of Underlying Shares as equals no
less than the then Current Required Minimum.

               (b) The Company shall maintain a reserve of shares of Common
Stock for issuance upon conversion of the Shares in full and upon exercise in
full of the Warrants in accordance with this Agreement, the Certificate of
Designation and the Warrants, respectively, in

                                      -12-
<PAGE>   13

such amount as may be required to fulfill its obligations in full under the
Transaction Documents, which reserve shall equal no less than the then Current
Required Minimum.

        3.7 Conversion and Exercise Obligations and Procedures. The Company
shall honor conversion of the Shares and exercise of the Warrants and shall
deliver Underlying Shares in accordance with the respective terms, conditions
and time periods set forth in the Certificate of Designation and Warrants. The
Transfer Agent Instructions, Conversion Notice (as defined in the Certificate of
Designation) and Notice of Exercise under the Warrants set forth the totality of
the procedures with respect to the conversion of the Shares and exercise of the
Warrants, including the form of legal opinion, if necessary, that shall be
rendered to the Company's transfer agent and such other information and
instructions as may be reasonably necessary to enable the Purchasers to convert
their Shares and exercise their Warrants as contemplated in the Certificate of
Designation and the Warrants (as applicable).

        3.8 Subsequent Financing; Limitation on Registrations. (a) From the date
of this Agreement through the first to occur of (i) the date on which an
Underlying Shares Registration Statement is first declared effective by the
Commission (such date, the "Effective Date") and (ii) the 150th day following
the Closing Date, other than to the Purchasers pursuant to this Agreement, the
Company will not offer, sell, grant any option to purchase or any right to
reprice securities, or otherwise dispose of (or announce any offer, sale, grant
or any option to purchase or other disposition) any Common Stock or equity or
equity equivalent securities (including the issuance of any debt or other
instrument that is at any time over the life thereof convertible into or
exchangeable for Common Stock), and the Company will cause its Subsidiaries not
to offer, sell or issue during such period any of such Subsidiary's securities
which provide the holder thereof the right to receive any Common Stock
(collectively, "Common Stock Equivalents").

               (b) From the date of this Agreement through the 360th day
following the Closing Date other than to the Purchasers pursuant to this
Agreement, the Company will not offer, sell, grant any option to purchase or any
right to reprice securities, or otherwise dispose of (or announce any offer,
sale, grant or any option to purchase or other disposition) any Common Stock or
Common Stock Equivalents (collectively, a "Subsequent Placement"), unless (A)
the Company delivers to each of the Purchasers a written notice (the "Subsequent
Placement Notice") of its intention to effect such Subsequent Placement, which
Subsequent Placement Notice shall describe in reasonable detail the proposed
terms of such Subsequent Placement, the amount of proceeds intended to be raised
thereunder, the Person with whom such Subsequent Placement shall be effected,
and attached to which shall be a term sheet or similar document relating thereto
and (B) such Purchaser shall not have notified the Company by 6:30 p.m. (New
York City time) on the tenth Trading Day after its receipt of the Subsequent
Placement Notice of its willingness to provide (or to cause its sole designee to
provide), subject to completion of mutually acceptable documentation, financing
to the Company on the same terms set forth in the Subsequent Placement Notice.
If the Purchasers shall fail to notify the Company of their intention to enter
into such negotiations within such time period, the Company may effect the
Subsequent Placement substantially upon the terms and to the Persons (or
Affiliates of such Persons) set forth in the Subsequent Placement Notice;
provided, that the Company shall provide

                                      -13-
<PAGE>   14

the Purchasers with a second Subsequent Placement Notice, and the Purchasers
shall again have the right of first refusal set forth above in this paragraph
(a), if the Subsequent Placement subject to the initial Subsequent Placement
Notice shall not have been consummated for any reason on the terms set forth in
such Subsequent Placement Notice within 30 Trading Days after the date of the
initial Subsequent Placement Notice with the Person (or an Affiliate of such
Person) identified in the Subsequent Placement Notice. If the Purchasers shall
indicate a willingness to provide financing in excess of the amount set forth in
the Subsequent Placement Notice, then each Purchaser shall be entitled to
provide financing pursuant to such Subsequent Placement Notice up to an amount
equal to such Purchaser's pro-rata portion of the aggregate number of Shares
purchased by such Purchaser under this Agreement, but the Company shall not be
required to accept financing from the Purchasers in an amount in excess of the
amount set forth in the Subsequent Placement Notice.

               (c) Except for (x) Registrable Securities (as defined in the
Registration Rights Agreement), (y) securities of the Company permitted pursuant
to Section 6(c) of the Registration Rights Agreement to be registered in the
Underlying Shares Registration Statement, and (z) Common Stock permitted to be
issued pursuant to Section 3.8(e), the Company may not until the 180th day after
the Effective Date (i) issue or sell any of its or any of its respective
Affiliates' equity or equity-equivalent securities pursuant to Regulation S
promulgated under the Securities Act, or (ii) file a registration statement to
register any of its securities.

               (d) With respect to Sections 3.8(a), (b) and (c), restrictive
periods shall be extended for the number of Trading Days during such period (A)
in which trading in the Common Stock is suspended by any securities exchange or
market or quotation system on which the Common Stock is then listed, or (B) that
the Underlying Shares Registration Statement is not effective following the
Effective Date, or (C) that the prospectus included in the Underlying Shares
Registration Statement may not be used by the holders thereof for the resale of
Registrable Securities following the Effective Date.

               (e) The restrictions contained in Section 3.8(a), (b) and (c)
shall not apply to the granting of options or warrants to employees, officers
and directors of the Company, and the issuance of Common Stock upon exercise of
such options or warrants granted under any stock option plan heretofore or
hereinafter duly adopted by the Company. The restrictions contained in Sections
3.8(a) and (b) shall also not apply to (1) shares of Common Stock issuable upon
exercise of any currently outstanding warrants and other outstanding convertible
securities of the Company, in each case as and to the extent disclosed in
Schedule 2.1(c) (but not as to any amendments or modifications of the terms of
such securities after the date of this Agreement, including "back-dated"
agreements) and (2) a transaction in which the Company issues shares of Common
Stock or Common Stock Equivalents to a Person which is, itself or through its
subsidiaries, an operating company in a business related to the business of the
Company and in which the Company receives material benefits in addition to the
investment of funds, but shall not include a transaction in which the Company is
issuing securities primarily for the purpose of raising capital or is issuing
securities to an entity whose primary business is investing in securities.

                                      -14-
<PAGE>   15

        3.9 Certain Securities Laws Disclosures; Publicity. The Company shall:
(i) on the Closing Date issue a press release acceptable to the Purchasers
disclosing the transactions contemplated hereby, (ii) file with the Commission a
Report on Form 8-K disclosing the transactions contemplated hereby within ten
Business Days after the Closing Date, and (iii) timely file with the Commission
a Form D promulgated under the Securities Act. The Company shall, no less than
two Business Days prior to the filing of any disclosure required by clauses (ii)
and (iii) above, provide a copy thereof to the Purchasers. The Company and the
Purchasers shall consult with each other in issuing any other press releases or
otherwise making public statements or filings and other communications with the
Commission or any regulatory agency or stock market or trading facility with
respect to the transactions contemplated hereby and neither party shall issue
any such press release or otherwise make any such public statement, filings or
other communications without the prior written consent of the other, except if
such disclosure is required by law or stock market or trading facility
regulation, in which such case the disclosing party shall promptly provide the
other party with prior notice of such public statement, filing or other
communication. Notwithstanding the foregoing, the Company shall not publicly
disclose the names of the Purchasers, or include the names of the Purchasers in
any filing with the Commission or any regulatory agency, trading facility or
stock market without the prior written consent of the Purchasers, except to the
extent such disclosure (but not any disclosure as to the controlling Persons
thereof) is required by law or stock market regulations, in which case the
Company shall provide the Purchasers with prior notice of such disclosure.

        3.10 Use of Proceeds. The Company shall use the net proceeds from the
sale of the Securities hereunder for working capital purposes and not for the
satisfaction of any portion of the Company's debt (other than payment of trade
payables in the ordinary course of the Company's business and prior practices),
to redeem any Company equity or equity-equivalent securities or to settle any
outstanding litigation.

        3.11 Transfer of Intellectual Property Rights. Except in connection with
the sale of all or substantially all of the assets of the Company or licensing
arrangements in the ordinary course of the Company's business, the Company shall
not transfer, sell or otherwise dispose of any Intellectual Property Rights, or
allow any of the Intellectual Property Rights to become subject to any Liens, or
fail to renew such Intellectual Property Rights (if renewable and it would
otherwise lapse if not renewed), without the prior written consent of the
Purchasers.

        3.12 Reimbursement. If any Purchaser becomes involved in any capacity in
any action, proceeding or investigation brought by or against any Person,
including stockholders of the Company, solely as a result of acquiring the
Securities under this Agreement, the Company will reimburse such Purchaser for
its reasonable legal and other expenses (including the cost of any
investigation, preparation and travel in connection therewith) not to exceed
$200,000 incurred in connection therewith, as such expenses are incurred. The
reimbursement obligations of the Company under this paragraph shall be in
addition to any liability which the Company may otherwise have, shall extend
upon the same terms and conditions to any Affiliates of the Purchasers who are
actually named in such action, proceeding or investigation, and partners,
directors, agents, employees and controlling persons (if any), as the case may
be, of the

                                      -15-
<PAGE>   16

Purchasers and any such Affiliate, and shall be binding upon and inure to the
benefit of any successors, assigns, heirs and personal representatives of the
Company, the Purchasers and any such Affiliate and any such Person. The Company
also agrees that neither the Purchasers nor any such Affiliates, partners,
directors, agents, employees or controlling persons shall have any liability to
the Company or any Person asserting claims on behalf of or in right of the
Company solely as a result of acquiring the Securities under this Agreement.

        3.13 Exclusivity. The Company shall not issue and sell the Shares to any
Person other than to the Purchasers.

        3.14 Shareholder Rights Plan. No claim will be made or enforced by the
Company or any other Person that any Purchaser is an "Acquiring Person" under
any shareholders rights plan or similar plan or arrangement in effect or
hereafter adopted by the Company, or that any Purchaser could be deemed to
trigger the provisions of any such plan or arrangement, by virtue of receiving
Securities or shares of Common Stock under the Transaction Documents.

        3.15 Trading Restrictions. Each Purchaser agrees that as long as such
Purchaser holds Shares, such Purchaser will not enter into any Short Sales (as
defined herein). For purposes hereof, a "Short Sale" by a Purchaser shall mean a
marked "short sale" of Common Stock by such Purchaser that is made at a time
when there is no equivalent offsetting long position in the Common Stock held by
such Purchaser. For purposes of determining whether there is an equivalent
offsetting long position in the Common Stock held by a Purchaser, Underlying
Shares issuable upon exercises of Warrants and upon delivered Conversion Notices
under the Shares shall be deemed to be held long by such Purchaser. However, the
restrictions against Short Sales contained in this Section shall expire and
become of no further force or effect from and after such date, if any, as the
Company breaches any of its conversion, exercise, registration or other material
obligations under the Transaction Documents (including, any failure of the
Effective Date to occur by the 75th day following the Closing Date).

                                   ARTICLE IV
                                  MISCELLANEOUS

               4.1 Fees and Expenses. At the Closing, the Company shall
reimburse the Purchasers for their legal fees and expenses incurred in
connection with the preparation and negotiation of the Transaction Documents by
paying to Robinson Silverman $25,000 for the preparation and negotiation of the
Transaction Documents. The amount contemplated by the immediately preceding
sentence shall be retained by the Purchasers and shall not be delivered to the
Company at the Closing. Other than the amount contemplated herein, and except as
otherwise set forth in the Registration Rights Agreement, each party shall pay
the fees and expenses of its advisers, counsel, accountants and other experts,
if any, and all other expenses incurred by such party incident to the
negotiation, preparation, execution, delivery and performance of this Agreement.
The Company shall pay all stamp and other taxes and duties levied in connection
with the issuance of the Securities.

                                      -16-
<PAGE>   17

               4.2 Entire Agreement; Amendments. The Transaction Documents,
together with the Exhibits and Schedules thereto and the Transfer Agent
Instructions contain the entire understanding of the parties with respect to the
subject matter hereof and supersede all prior agreements and understandings,
oral or written, with respect to such matters, which the parties acknowledge
have been merged into such documents, exhibits and schedules.

               4.3 Notices. Any and all notices or other communications or
deliveries required or permitted to be provided hereunder shall be in writing
and shall be deemed given and effective on the earliest of (i) the date of
transmission, if such notice or communication is delivered via facsimile at the
facsimile telephone number specified in this Section prior to 6:30 p.m. (New
York City time) on a Business Day, (ii) the Business Day after the date of
transmission, if such notice or communication is delivered via facsimile at the
facsimile telephone number specified in this Agreement later than 6:30 p.m. (New
York City time) on any date and earlier than 11:59 p.m. (New York City time) on
such date, (iii) the Business Day following the date of mailing, if sent by
nationally recognized overnight courier service, or (iv) upon actual receipt by
the party to whom such notice is required to be given. The address for such
notices and communications shall be as follows:

        If to the Company:          e.Digital Corporation
                                    13114 Evening Creek Drive South
                                    San Diego, California 92128
                                    Facsimile No.: (858) 486-3922
                                    Attn:  Chief Executive Officer

        With copies to:             Higham, McConnell& Dunning LLP
                                    28202 Cabot Road, Suite 450
                                    Laguna Niguel, California 92677
                                    Facsimile No.: (949) 365-5522
                                    Attn: Curt C. Barwick, Esq.

        If to a Purchaser:          To the address set forth under such
                                    Purchaser's name on the signature
                                    pages hereto.

or such other address as may be designated in writing hereafter, in the same
manner, by such Person.

               4.4 Amendments; Waivers. No provision of this Agreement may be
waived or amended except in a written instrument signed, in the case of an
amendment, by the Company and each of the Purchasers or, in the case of a
waiver, by the party against whom enforcement of any such waiver is sought. No
waiver of any default with respect to any provision, condition or requirement of
this Agreement shall be deemed to be a continuing waiver in the future or a
waiver of any other provision, condition or requirement hereof, nor shall any
delay or omission of either party to exercise any right hereunder in any manner
impair the exercise of any such right accruing to it thereafter.

                                      -17-
<PAGE>   18

               4.5 Headings. The headings herein are for convenience only, do
not constitute a part of this Agreement and shall not be deemed to limit or
affect any of the provisions hereof.

               4.6 Successors and Assigns. This Agreement shall be binding upon
and inure to the benefit of the parties and their successors and permitted
assigns. The Company may not assign this Agreement or any rights or obligations
hereunder without the prior written consent of the Purchasers. Except as set
forth in Section 3.1(a), the Purchasers may not assign this Agreement or any of
the rights or obligations hereunder without the consent of the Company. This
provision shall not limit any Purchaser's right to transfer securities or
transfer or assign rights under the Registration Rights Agreement.

               4.7 No Third-Party Beneficiaries. This Agreement is intended for
the benefit of the parties hereto and their respective successors and permitted
assigns and is not for the benefit of, nor may any provision hereof be enforced
by, any other Person.

               4.8 Governing Law. All questions concerning the construction,
validity, enforcement and interpretation of this Agreement shall be governed by
and construed and enforced in accordance with the internal laws of the State of
New York, without regard to the principles of conflicts of law thereof. Each
party hereby irrevocably submits to the exclusive jurisdiction of the state and
federal courts sitting in the City of New York, borough of Manhattan, for the
adjudication of any dispute hereunder or in connection herewith or with any
transaction contemplated hereby or discussed herein (including with respect to
the enforcement of the Transaction Documents), and hereby irrevocably waives,
and agrees not to assert in any suit, action or proceeding, any claim that it is
not personally subject to the jurisdiction of any such court, that such suit,
action or proceeding is improper. Each party hereby irrevocably waives personal
service of process and consents to process being served in any such suit, action
or proceeding by mailing a copy thereof via registered or certified mail or
overnight delivery (with evidence of delivery) to such party at the address in
effect for notices to it under this Agreement and agrees that such service shall
constitute good and sufficient service of process and notice thereof. Nothing
contained herein shall be deemed to limit in any way any right to serve process
in any manner permitted by law.

               4.9 Survival. The representations, warranties, agreements and
covenants contained herein shall survive the Closing and the delivery and
conversion or exercise (as the case may be) of the Shares and of the Warrants.

               4.10 Execution. This Agreement may be executed in two or more
counterparts, all of which when taken together shall be considered one and the
same agreement and shall become effective when counterparts have been signed by
each party and delivered to the other party, it being understood that both
parties need not sign the same counterpart. In the event that any signature is
delivered by facsimile transmission, such signature shall create a valid and
binding obligation of the party executing (or on whose behalf such signature is
executed) the same with the same force and effect as if such facsimile signature
page were an original thereof.

                                      -18-
<PAGE>   19

               4.11 Severability. In case any one or more of the provisions of
this Agreement shall be invalid or unenforceable in any respect, the validity
and enforceability of the remaining terms and provisions of this Agreement shall
not in any way be affecting or impaired thereby and the parties will attempt to
agree upon a valid and enforceable provision which shall be a reasonable
substitute therefor, and upon so agreeing, shall incorporate such substitute
provision in this Agreement.

               4.12 Remedies. In addition to being entitled to exercise all
rights provided herein or granted by law, including recovery of damages, each of
the Purchasers and the Company will be entitled to specific performance of each
other's obligations under the Transaction Documents. The parties agree that
monetary damages may not be adequate compensation for any loss incurred by
reason of any breach of obligations described in the foregoing sentence and
hereby agree to waive in any action for specific performance of any such
obligation the defense that a remedy at law would be adequate.

               4.13 Independent Nature of Purchasers' Obligations and Rights.
The obligations of each Purchaser under any Transaction Document is several and
not joint with the obligations of any other Purchaser and no Purchaser shall be
responsible in any way for the performance of the obligations of any other
Purchaser under any Transaction Document. Nothing contained herein or in any
Transaction Document, and no action taken by any Purchaser pursuant thereto,
shall be deemed to constitute the Purchasers as a partnership, an association, a
joint venture or any other kind of entity, or create a presumption that the
Purchasers are in any way acting in concert with respect to such obligations or
the transactions contemplated by the Transaction Document. Each Purchaser shall
be entitled to independently protect and enforce its rights, including without
limitation the rights arising out of this Agreement or out of the other
Transaction Documents, and it shall not be necessary for any other Purchaser to
be joined as an additional party in any proceeding for such purpose.

                   [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK
                             SIGNATURE PAGES FOLLOW]

                                      -19-
<PAGE>   20

               IN WITNESS WHEREOF, the parties hereto have caused this
Convertible Preferred Stock Purchase Agreement to be duly executed by their
respective authorized signatories as of the date first indicated above.

                             E.DIGITAL CORPORATION

                             By:
                                ------------------------------------------------
                                    Name:
                                    Title:

                   [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK
                      SIGNATURE PAGES OF PURCHASERS FOLLOW]

                                      -20-
<PAGE>   21

                             MILLENNIUM PARTNERS L.P.

                             By:
                                ------------------------------------------------
                             Name:
                             Title:

                             Purchase Price:              $2,000,000

                             Number of Closing Warrants: 115,473

                             Address for Notice:

                             Millennium Partners L.P.
                             c/o Millennium Management, L.L.C.
                             666 Fifth Avenue,
                             New York, New York 10103
                             Facsimile No.: (212) 841-6302
                             Attn: Daniel Cardella

                             With copies to:

                             Robinson Silverman Pearce Aronsohn & Berman LLP
                             1290 Avenue of the Americas
                             New York, NY  10104
                             Facsimile No.:  (212) 541-4630 and (212) 541-1432
                             Attn: Eric L. Cohen, Esq.

                                      -21-
<PAGE>   22

                             AIG SOUNDSHORE HOLDINGS LTD.

                             By:
                                ------------------------------------------------
                             Name:
                             Title:

                             Purchase Price:                     $850,000

                             Number of Closing Warrants: 49,076

                             Address for Notice:

                             AIG SoundShore Holdings Ltd.
                             c/o AIG SoundShore LLC
                             1281 East Main Street,
                             Stamford, CT 06902
                             Facsimile No.: (203) 324-8498
                             Attn: Michael Hamblett

                             With copies to:

                             Robinson Silverman Pearce Aronsohn & Berman LLP
                             1290 Avenue of the Americas
                             New York, NY  10104
                             Facsimile No.:  (212) 541-4630 and (212) 541-1432
                             Attn: Eric L. Cohen, Esq.

                                      -22-
<PAGE>   23

                      AIG SOUNDSHORE OPPORTUNITY FUND LTD.

                             By:
                                ------------------------------------------------
                             Name:
                             Title:

                             Purchase Price:              $480,000

                             Number of Closing Warrants: 27,714

                             Address for Notice:

                             AIG SoundShore Opportunity Fund Ltd.
                             c/o AIG SoundShore LLC
                             1281 East Main Street,
                             Stamford, CT 06902
                             Facsimile No.: (203) 324-8498
                             Attn: Michael Hamblett

                             With copies to:

                             Robinson Silverman Pearce Aronsohn & Berman LLP
                             1290 Avenue of the Americas
                             New York, NY  10104
                             Facsimile No.:  (212) 541-4630 and (212) 541-1432
                             Attn: Eric L. Cohen, Esq.

                                      -23-
<PAGE>   24

                             AIG SOUNDSHORE STRATEGIC
                             HOLDING FUND LTD

                             By:
                                ------------------------------------------------
                             Name:
                             Title:

                             Purchase Price:              $420,000

                             Number of Closing Warrants: 24,249

                             Address for Notice:

                             AIG SoundShore Strategic Holdings Ltd.
                             c/o AIG SoundShore LLC
                             1281 East Main Street,
                             Stamford, CT 06902
                             Facsimile No.: (203) 324-8498
                             Attn: Michael Hamblett

                             With copies to:

                             Robinson Silverman Pearce Aronsohn & Berman LLP
                             1290 Avenue of the Americas
                             New York, NY  10104
                             Facsimile No.:  (212) 541-4630 and (212) 541-1432
                             Attn: Eric L. Cohen, Esq.

                                      -24-
<PAGE>   25

                             AIG SOUNDSHORE PRIVATE
                             INVESTORS FUND LTD.

                             By:
                                ------------------------------------------------
                             Name:
                             Title:

                             Purchase Price:              $250,000

                             Number of Closing Warrants: 14,434

                             Address for Notice:

                             AIG SoundShore Private Investors Fund Ltd.
                             c/o AIG SoundShore LLC
                             1281 East Main Street,
                             Stamford, CT 06902
                             Facsimile No.: (203) 324-8498
                             Attn: Michael Hamblett

                             With copies to:

                             Robinson Silverman Pearce Aronsohn & Berman LLP
                             1290 Avenue of the Americas
                             New York, NY  10104
                             Facsimile No.:  (212) 541-4630 and (212) 541-1432
                             Attn: Eric L. Cohen, Esq.

                                      -25-
<PAGE>   26

                 CONVERTIBLE PREFERRED STOCK PURCHASE AGREEMENT

                                      Among

                              E.DIGITAL CORPORATION

                                       and

                         THE INVESTORS SIGNATORY HERETO

                           Dated as of October 4, 2000<PAGE>   1
                                                                     EXHIBIT 4.6

                         REGISTRATION RIGHTS AGREEMENT

               This Registration Rights Agreement (this "Agreement") is made and
entered into as of October 5, 2000, among e.Digital Corporation, a Delaware
corporation (the "Company"), and the investors signatory hereto (each such
investor is a "Purchaser" and all such investors are, collectively, the
"Purchasers").

               This Agreement is made pursuant to the Convertible Preferred
Stock Purchase Agreement, dated as of the date hereof among the Company and the
Purchasers (the "Purchase Agreement").

               The Company and the Purchasers hereby agree as follows:

        1. Definitions

               Capitalized terms used and not otherwise defined herein that are
defined in the Purchase Agreement shall have the meanings given such terms in
the Purchase Agreement. As used in this Agreement, the following terms shall
have the following meanings:

               "Affiliate" means, with respect to any Person, any other Person
that directly or indirectly controls or is controlled by or under common control
with such Person. For the purposes of this definition, "control," when used with
respect to any Person, means the possession, direct or indirect, of the power to
direct or cause the direction of the management and policies of such Person,
whether through the ownership of voting securities, by contract or otherwise;
and the terms of "affiliated," "controlling" and "controlled" have meanings
correlative to the foregoing.

               "Business Day" means any day except Saturday, Sunday and any day
which shall be a legal holiday or a day on which banking institutions in the
State of New York or the State of California are authorized or required by law
or other government actions to close.

               "Certificate of Designation" shall have the meaning set forth in
the Purchase Agreement.

               "Closing Date" shall have the meaning set forth in the Purchase
Agreement.

               "Commission" means the Securities and Exchange Commission.

               "Common Stock" means the Company's common stock, $.001 par value,
or such securities into which that such stock shall hereafter be reclassified.

               "Effectiveness Date" means with respect to the initial
Registration Statement required to be filed hereunder, the 75th day following
the Closing Date and, with respect to any additional Registration Statements
which may be required pursuant to Section 3(c), the 75th day

<PAGE>   2

following the date that notice of the requirement to file such additional
Registration Statement is provided.

               "Effectiveness Period" shall have the meaning set forth in
Section 2(a).

               "Exchange Act" means the Securities Exchange Act of 1934, as
amended.

               "Filing Date"means the 30th day following the Closing Date and,
with respect to any additional Registration Statements which may be required
pursuant to Section 3(c), the 30th day following the date that notice of the
requirement to file such additional Registration Statement is provided.

               "Holder" or "Holders" means the holder or holders, as the case
may be, from time to time of Registrable Securities.

               "Indemnified Party" shall have the meaning set forth in Section
5(c).

               "Indemnifying Party" shall have the meaning set forth in Section
5(c).

               "Losses" shall have the meaning set forth in Section 5(a).

               "Person" means an individual or a corporation, partnership,
trust, incorporated or unincorporated association, joint venture, limited
liability company, joint stock company, government (or an agency or political
subdivision thereof) or other entity of any kind.

               "Preferred Stock" means the Company's 7% Series C Convertible
Preferred Stock issued or issuable to the Purchasers in accordance with the
Purchase Agreement.

               "Proceeding" means an action, claim, suit, investigation or
proceeding (including, without limitation, an investigation or partial
proceeding, such as a deposition), whether commenced or threatened.

               "Prospectus" means the prospectus included in the Registration
Statement (including, without limitation, a prospectus that includes any
information previously omitted from a prospectus filed as part of an effective
registration statement in reliance upon Rule 430A promulgated under the
Securities Act), as amended or supplemented by any prospectus supplement, with
respect to the terms of the offering of any portion of the Registrable
Securities covered by the Registration Statement, and all other amendments and
supplements to the Prospectus, including post-effective amendments, and all
material incorporated by reference or deemed to be incorporated by reference in
such Prospectus.

               "Registrable Securities" means the shares of Common Stock
issuable upon conversion in full of the Preferred Stock and exercise in full of
the Warrants.

               "Registration Statement" means the registration statement and any
additional registration statements contemplated by Section 3(c), including (in
each case) the Prospectus,

                                      -2-
<PAGE>   3

amendments and supplements to such registration statement or Prospectus,
including pre- and post-effective amendments, all exhibits thereto, and all
material incorporated by reference or deemed to be incorporated by reference in
such registration statement.

               "Rule 144" means Rule 144 promulgated by the Commission pursuant
to the Securities Act, as such Rule may be amended from time to time, or any
similar rule or regulation hereafter adopted by the Commission having
substantially the same effect as such Rule.

               "Rule 415" means Rule 415 promulgated by the Commission pursuant
to the Securities Act, as such Rule may be amended from time to time, or any
similar rule or regulation hereafter adopted by the Commission having
substantially the same effect as such Rule.

               "Rule 424" means Rule 424 promulgated by the Commission pursuant
to the Securities Act, as such Rule may be amended from time to time, or any
similar rule or regulation hereafter adopted by the Commission having
substantially the same effect as such Rule.

               "Securities Act" means the Securities Act of 1933, as amended,
and the rules and regulations promulgated thereunder.

               "Special Counsel" means one special counsel to the Holders, for
which the Holders will be reimbursed by the Company pursuant to Section 4.

               "Warrants" shall mean the Common Stock purchase warrants issued
to (i) the Purchasers pursuant to the Purchase Agreement and (ii) to Jesup &
Lamont Securities Corp. as compensation in connection with the transaction
contemplated by the Purchase Agreement.

        2. Shelf Registration

               (a) On or prior to each Filing Date, the Company shall prepare
and file with the Commission a "Shelf" Registration Statement covering the
resale of all Registrable Securities for an offering to be made on a continuous
basis pursuant to Rule 415. The Registration Statement shall be on Form S-3
(except if the Company is not then eligible to register for resale the
Registrable Securities on Form S-3, in which case such registration shall be on
another appropriate form) and shall contain (except if otherwise directed by the
Holders) the "Plan of Distribution" attached hereto as Annex A. The Company
shall use its best efforts to cause the Registration Statement to be declared
effective under the Securities Act as promptly as possible after the filing
thereof, but in any event prior to the Effectiveness Date, and shall use its
best efforts to keep such Registration Statement continuously effective under
the Securities Act until the date which is two years after the date that such
Registration Statement is declared effective by the Commission or such earlier
date when all Registrable Securities covered by such Registration Statement have
been sold or may be sold without volume restrictions pursuant to Rule 144(k)
(the "Effectiveness Period").

               (b) The initial Registration Statement to be filed hereunder
shall include a number of shares of Common Stock equal to no less than the sum
of (i) the number of shares of

                                      -3-
<PAGE>   4

Common Stock issuable upon conversion in full of the outstanding Preferred
Stock, assuming for such purposes that such shares of Preferred Stock are
outstanding for five years, and that all accrued dividends are added to the
Stated Value (as defined in the Certificate of Designation), (ii) the number of
shares of Common Stock issuable upon exercise in full of the Warrants, and (iii)
the number of shares of Common Stock issuable to Jesup & Lamont Securities Corp.
upon exercise in full of the Warrants.

               (c) If (a) a Registration Statement is not filed on or prior to
its Filing Date (if the Company files such Registration Statement without
affording the Holder the opportunity to review and comment on the same as
required by Section 3(a) hereof, the Company shall not be deemed to have
satisfied this clause (a)), or (b) the Company fails to file with the Commission
a request for acceleration in accordance with Rule 461 promulgated under the
Securities Act, within five Business Days of the date that the Company is
notified (orally or in writing, whichever is earlier) by the Commission that a
Registration Statement will not be "reviewed," or not subject to further review,
or (c) a Registration Statement filed hereunder is not declared effective by the
Commission on or prior to its Effectiveness Date, or (d) after a Registration
Statement is filed with and declared effective by the Commission, such
Registration Statement ceases to be effective as to all Registrable Securities
to which it is required to relate at any time prior to the expiration of the
Effectiveness Period without being succeeded within ten Business Days by an
amendment to such Registration Statement or by a subsequent Registration
Statement filed with and declared effective by the Commission, or (e) the Common
Stock shall be delisted or suspended from trading on the OTC Bulletin Board
("OTC") or on the Nasdaq National Market, the New York Stock Exchange, the
American Stock Exchange or the Nasdaq Smallcap Market (each, a "Subsequent
Market") for more than five Business Days (which need not be consecutive
Business Days), or (f) the conversion or exercise rights of the Holders pursuant
to Certificate of Designation and the Warrants are suspended for any reason, or
(g) an amendment to a Registration Statement is not filed by the Company with
the Commission within ten Business Days of the Commission's notifying the
Company that such amendment is required in order for such Registration Statement
to be declared effective (any such failure or breach being referred to as an
"Event," and for purposes of clauses (a), (c), (f) the date on which such Event
occurs, or for purposes of clause (b) the date on which such five Business Day
period is exceeded, or for purposes of clauses (d) and (g) the date which such
ten Business Day-period is exceeded, or for purposes of clause (e) the date on
which such five Business Day-period is exceeded, being referred to as "Event
Date"), then, on each such Event Date and every monthly anniversary thereof
until the applicable Event is cured, the Company shall pay to each Holder an
amount in cash, as liquidated damages and not as a penalty, equal to 2.0% of the
purchase price paid by such Holder pursuant to the Purchase Agreement. If the
Company fails to pay any liquidated damages pursuant to this Section in full
within seven days after the date payable, the Company will pay interest thereon
at a rate of 18% per annum (or such lesser maximum amount that is permitted to
be paid by applicable law) to the Holder, accruing daily from the date such
liquidated damages are due until such amounts, plus all such interest thereon,
are paid in full and at the option of the Holder, such liquidated damages be
paid in shares of Common Stock under the Vesting Warrant. The liquidated damages
pursuant to the terms hereof shall apply on a pro-rata basis for any portion of
a month prior to the cure of an Event.

                                      -4-
<PAGE>   5

        3. Registration Procedures

               In connection with the Company's registration obligations
hereunder, the Company shall:

               (a) Not less than five Business Days prior to the filing of each
Registration Statement or any related Prospectus or any amendment or supplement
thereto (including any document that would be incorporated or deemed to be
incorporated therein by reference), the Company shall, (i) furnish to the
Holders and their Special Counsel copies of all such documents proposed to be
filed, which documents (other than those incorporated or deemed to be
incorporated by reference) will be subject to the review of such Holders and
their Special Counsel, and (ii) cause its officers and directors, counsel and
independent certified public accountants to respond to such inquiries as shall
be necessary, in the reasonable opinion of respective counsel to conduct a
reasonable investigation within the meaning of the Securities Act. The Company
shall not file the Registration Statement or any such Prospectus or any
amendments or supplements thereto to which the Holders of a majority of the
Registrable Securities and their Special Counsel shall reasonably object,
provided, the Company is notified of such objection no later than 3 Business
Days after the Holders have been so furnished copies of such documents.

               (b) (i) Prepare and file with the Commission such amendments,
including post-effective amendments, to the Registration Statement and the
Prospectus used in connection therewith as may be necessary to keep the
Registration Statement continuously effective as to the applicable Registrable
Securities for the Effectiveness Period and prepare and file with the Commission
such additional Registration Statements in order to register for resale under
the Securities Act all of the Registrable Securities; (ii) cause the related
Prospectus to be amended or supplemented by any required Prospectus supplement,
and as so supplemented or amended to be filed pursuant to Rule 424; (iii)
respond as promptly as reasonably possible, and in any event within twenty days,
to any comments received from the Commission with respect to the Registration
Statement or any amendment thereto and as promptly as reasonably possible
provide the Holders true and complete copies of all correspondence from and to
the Commission relating to the Registration Statement; and (iv) comply in all
material respects with the provisions of the Securities Act and the Exchange Act
with respect to the disposition of all Registrable Securities covered by the
Registration Statement during the applicable period in accordance with the
intended methods of disposition by the Holders thereof set forth in the
Registration Statement as so amended or in such Prospectus as so supplemented.

               (c) File additional Registration Statements if the number of
Registrable Securities at any time exceeds 85% of the number of shares of Common
Stock then registered for the account of the Holders in all existing
Registration Statements hereunder.

               (d) Notify the Holders of Registrable Securities to be sold and
their Special Counsel as promptly as reasonably possible (and, in the case of
(i)(A) below, not less than five Business Days prior to such filing) and (if
requested by any such Person) confirm such notice in writing no later than one
Business Day following the day (i)(A) when a Prospectus or any

                                      -5-
<PAGE>   6

Prospectus supplement or post-effective amendment to the Registration Statement
is proposed to be filed; (B) when the Commission notifies the Company whether
there will be a "review" of such Registration Statement and whenever the
Commission comments in writing on such Registration Statement (the Company shall
provide true and complete copies thereof and all written responses thereto to
each of the Holders); and (C) with respect to the Registration Statement or any
post-effective amendment, when the same has become effective; (ii) of any
request by the Commission or any other Federal or state governmental authority
for amendments or supplements to the Registration Statement or Prospectus or for
additional information; (iii) of the issuance by the Commission of any stop
order suspending the effectiveness of the Registration Statement covering any or
all of the Registrable Securities or the initiation of any Proceedings for that
purpose; (iv) if at any time any of the representations and warranties of the
Company contained in any agreement contemplated hereby ceases to be true and
correct in all material respects; (v) of the receipt by the Company of any
notification with respect to the suspension of the qualification or exemption
from qualification of any of the Registrable Securities for sale in any
jurisdiction, or the initiation or threatening of any Proceeding for such
purpose; and (vi) of the occurrence of any event or passage of time that makes
the financial statements included in the Registration Statement ineligible for
inclusion therein or any statement made in the Registration Statement or
Prospectus or any document incorporated or deemed to be incorporated therein by
reference untrue in any material respect or that requires any revisions to the
Registration Statement, Prospectus or other documents so that, in the case of
the Registration Statement or the Prospectus, as the case may be, it will not
contain any untrue statement of a material fact or omit to state any material
fact required to be stated therein or necessary to make the statements therein,
in light of the circumstances under which they were made, not misleading.

               (e) Promptly deliver to each Holder and their Special Counsel,
without charge, as many copies of the Prospectus or Prospectuses (including each
form of prospectus) and each amendment or supplement thereto as such Persons may
reasonably request. The Company hereby consents to the use of such Prospectus
and each amendment or supplement thereto by each of the selling Holders in
connection with the offering and sale of the Registrable Securities covered by
such Prospectus and any amendment or supplement thereto.

               (f) Prior to any public offering of Registrable Securities, use
its best efforts to register or qualify or cooperate with the selling Holders
and their Special Counsel in connection with the registration or qualification
(or exemption from such registration or qualification) of such Registrable
Securities for offer and sale under the securities or Blue Sky laws of such
jurisdictions within the United States as any Holder requests in writing, to
keep each such registration or qualification (or exemption therefrom) effective
during the Effectiveness Period and to do any and all other acts or things
necessary or advisable to enable the disposition in such jurisdictions of the
Registrable Securities covered by a Registration Statement; provided, that the
Company shall not be required to qualify generally to do business in any
jurisdiction where it is not then so qualified or subject the Company to any
material tax in any such jurisdiction where it is not then so subject.

                                      -6-
<PAGE>   7

               (g) Cooperate with the Holders to facilitate the timely
preparation and delivery of certificates representing Registrable Securities to
be delivered to a transferee pursuant to a Registration Statement, which
certificates shall be free, to the extent permitted by the Purchase Agreement,
of all restrictive legends, and to enable such Registrable Securities to be in
such denominations and registered in such names as any such Holders may request.

               (h) Upon the occurrence of any event contemplated by Section
3(d)(vi), as promptly as reasonably possible, prepare a supplement or amendment,
including a post-effective amendment, to the Registration Statement or a
supplement to the related Prospectus or any document incorporated or deemed to
be incorporated therein by reference, and file any other required document so
that, as thereafter delivered, neither the Registration Statement nor such
Prospectus will contain an untrue statement of a material fact or omit to state
a material fact required to be stated therein or necessary to make the
statements therein, in light of the circumstances under which they were made,
not misleading.

               (i) Comply with all applicable rules and regulations of the
Commission.

        4. Registration Expenses. All fees and expenses incident to the
performance of or compliance with this Agreement by the Company shall be borne
by the Company whether or not any Registrable Securities are sold pursuant to
the Registration Statement. The fees and expenses referred to in the foregoing
sentence shall include, without limitation, (i) all registration and filing fees
(including, without limitation, fees and expenses (A) with respect to filings
required to be made with the OTC and any Subsequent Market on which the Common
Stock is then listed for trading, and (B) in compliance with applicable state
securities or Blue Sky laws (including, without limitation, fees and
disbursements of counsel for the Company in connection with Blue Sky
qualifications or exemptions of the Registrable Securities and determination of
the eligibility of the Registrable Securities for investment under the laws of
such jurisdictions as requested by the Holders )), (ii) printing expenses
(including, without limitation, expenses of printing certificates for
Registrable Securities and of printing prospectuses requested by the Holders),
(iii) messenger, telephone and delivery expenses, (iv) fees and disbursements of
counsel for the Company and Special Counsel for the Holders and (v) fees and
expenses of all other Persons retained by the Company in connection with the
consummation of the transactions contemplated by this Agreement.

        5. Indemnification

               (a) Indemnification by the Company. The Company shall,
notwithstanding any termination of this Agreement, indemnify and hold harmless
each Holder, the officers, directors, agents, brokers (including brokers who
offer and sell Registrable Securities as principal as a result of a pledge or
any failure to perform under a margin call of Common Stock), investment advisors
and employees of each of them, each Person who controls any such Holder (within
the meaning of Section 15 of the Securities Act or Section 20 of the Exchange
Act) and the officers, directors, agents and employees of each such controlling
Person, to the fullest extent permitted by applicable law, from and against any
and all losses, claims, damages, liabilities, costs (including, without
limitation, costs of preparation and attorneys' fees) and expenses

                                      -7-
<PAGE>   8

(collectively, "Losses"), as incurred, arising out of or relating to any untrue
or alleged untrue statement of a material fact contained in the Registration
Statement, any Prospectus or any form of prospectus or in any amendment or
supplement thereto or in any preliminary prospectus, or arising out of or
relating to any omission or alleged omission of a material fact required to be
stated therein or necessary to make the statements therein (in the case of any
Prospectus or form of prospectus or supplement thereto, in light of the
circumstances under which they were made) not misleading, except to the extent,
but only to the extent, that (1) such untrue statements or omissions are based
solely upon information regarding such Holder furnished in writing to the
Company by such Holder expressly for use therein, or to the extent that such
information relates to such Holder or such Holder's proposed method of
distribution of Registrable Securities and was reviewed and expressly approved
in writing by such Holder expressly for use in the Registration Statement, such
Prospectus or such form of Prospectus or in any amendment or supplement thereto
or (2) in the case of an occurrence of an event of the type specified in Section
3(d)(ii)-(vi), the use by such Holder of an outdated or defective Prospectus
after the Company has notified such Holder in writing that the Prospectus is
outdated or defective and prior to the receipt by such Holder of the Advice
contemplated in Section 6(e). The Company shall notify the Holders promptly of
the institution, threat or assertion of any Proceeding of which the Company is
aware in connection with the transactions contemplated by this Agreement.

               (b) Indemnification by Holders. Each Holder shall, severally and
not jointly, indemnify and hold harmless the Company, its directors, officers,
agents and employees, each Person who controls the Company (within the meaning
of Section 15 of the Securities Act and Section 20 of the Exchange Act), and the
directors, officers, agents or employees of such controlling Persons, to the
fullest extent permitted by applicable law, from and against all Losses (as
determined by a court of competent jurisdiction in a final judgment not subject
to appeal or review) arising solely out of or based solely upon any untrue
statement of a material fact contained in any Registration Statement, any
Prospectus, or any form of prospectus, or in any amendment or supplement
thereto, or arising solely out of or based solely upon any omission of a
material fact required to be stated therein or necessary to make the statements
therein not misleading to the extent, but only to the extent, that such untrue
statement or omission is contained in any information so furnished in writing by
such Holder to the Company specifically for inclusion in such Registration
Statement or such Prospectus or to the extent that (1) such untrue statements or
omissions are based solely upon information regarding such Holder furnished in
writing to the Company by such Holder expressly for use therein, or to the
extent that such information relates to such Holder or such Holder's proposed
method of distribution of Registrable Securities and was reviewed and expressly
approved in writing by such Holder expressly for use in the Registration
Statement, such Prospectus or such form of Prospectus or in any amendment or
supplement thereto or (2) in the case of an occurrence of an event of the type
specified in Section 3(d)(ii)-(vi), the use by such Holder of an outdated or
defective Prospectus after the Company has notified such Holder in writing that
the Prospectus is outdated or defective and prior to the receipt by such Holder
of the Advice contemplated in Section 6(e). In no event shall the liability of
any selling Holder hereunder be greater in amount than the dollar amount of the
net proceeds received by such Holder upon the sale of the Registrable Securities
giving rise to such indemnification obligation.

                                      -8-
<PAGE>   9

               (c) Conduct of Indemnification Proceedings. If any Proceeding
shall be brought or asserted against any Person entitled to indemnity hereunder
(an "Indemnified Party"), such Indemnified Party shall promptly notify the
Person from whom indemnity is sought (the "Indemnifying Party") in writing, and
the Indemnifying Party shall assume the defense thereof, including the
employment of counsel reasonably satisfactory to the Indemnified Party and the
payment of all fees and expenses incurred in connection with defense thereof;
provided, that the failure of any Indemnified Party to give such notice shall
not relieve the Indemnifying Party of its obligations or liabilities pursuant to
this Agreement, except (and only) to the extent that it shall be finally
determined by a court of competent jurisdiction (which determination is not
subject to appeal or further review) that such failure shall have proximately
and materially adversely prejudiced the Indemnifying Party.

               An Indemnified Party shall have the right to employ separate
counsel in any such Proceeding and to participate in the defense thereof, but
the fees and expenses of such counsel shall be at the expense of such
Indemnified Party or Parties unless: (1) the Indemnifying Party has agreed in
writing to pay such fees and expenses; or (2) the Indemnifying Party shall have
failed promptly to assume the defense of such Proceeding and to employ counsel
reasonably satisfactory to such Indemnified Party in any such Proceeding; or (3)
the named parties to any such Proceeding (including any impleaded parties)
include both such Indemnified Party and the Indemnifying Party, and such
Indemnified Party shall have been advised by counsel that a conflict of interest
is likely to exist if the same counsel were to represent such Indemnified Party
and the Indemnifying Party (in which case, if such Indemnified Party notifies
the Indemnifying Party in writing that it elects to employ separate counsel at
the expense of the Indemnifying Party, the Indemnifying Party shall not have the
right to assume the defense thereof and such counsel shall be at the expense of
the Indemnifying Party). The Indemnifying Party shall not be liable for any
settlement of any such Proceeding effected without its written consent, which
consent shall not be unreasonably withheld. No Indemnifying Party shall, without
the prior written consent of the Indemnified Party, effect any settlement of any
pending Proceeding in respect of which any Indemnified Party is a party, unless
such settlement includes an unconditional release of such Indemnified Party from
all liability on claims that are the subject matter of such Proceeding.

               All fees and expenses of the Indemnified Party (including
reasonable fees and expenses to the extent incurred in connection with
investigating or preparing to defend such Proceeding in a manner not
inconsistent with this Section) shall be paid to the Indemnified Party, as
incurred, within ten Business Days of written notice thereof to the Indemnifying
Party (regardless of whether it is ultimately determined that an Indemnified
Party is not entitled to indemnification hereunder; provided, that the
Indemnifying Party may require such Indemnified Party to undertake to reimburse
all such fees and expenses to the extent it is finally judicially determined
that such Indemnified Party is not entitled to indemnification hereunder).

               (d) Contribution. If a claim for indemnification under Section
5(a) or 5(b) is unavailable to an Indemnified Party (by reason of public policy
or otherwise), then each Indemnifying Party, in lieu of indemnifying such
Indemnified Party, shall contribute to the amount paid or payable by such
Indemnified Party as a result of such Losses, in such proportion

                                      -9-
<PAGE>   10
as is appropriate to reflect the relative fault of the Indemnifying Party and
Indemnified Party in connection with the actions, statements or omissions that
resulted in such Losses as well as any other relevant equitable considerations.
The relative fault of such Indemnifying Party and Indemnified Party shall be
determined by reference to, among other things, whether any action in question,
including any untrue or alleged untrue statement of a material fact or omission
or alleged omission of a material fact, has been taken or made by, or relates to
information supplied by, such Indemnifying Party or Indemnified Party, and the
parties' relative intent, knowledge, access to information and opportunity to
correct or prevent such action, statement or omission. The amount paid or
payable by a party as a result of any Losses shall be deemed to include, subject
to the limitations set forth in Section 5(c), any reasonable attorneys' or other
reasonable fees or expenses incurred by such party in connection with any
Proceeding to the extent such party would have been indemnified for such fees or
expenses if the indemnification provided for in this Section was available to
such party in accordance with its terms.

               The parties hereto agree that it would not be just and equitable
if contribution pursuant to this Section 5(d) were determined by pro rata
allocation or by any other method of allocation that does not take into account
the equitable considerations referred to in the immediately preceding paragraph.
Notwithstanding the provisions of this Section 5(d), no Holder shall be required
to contribute, in the aggregate, any amount in excess of the amount by which the
proceeds actually received by such Holder from the sale of the Registrable
Securities subject to the Proceeding exceeds the amount of any damages that such
Holder has otherwise been required to pay by reason of such untrue or alleged
untrue statement or omission or alleged omission.

               The indemnity and contribution agreements contained in this
Section are in addition to any liability that the Indemnifying Parties may have
to the Indemnified Parties.

        6. Miscellaneous

               (a) Amendments and Waivers. The provisions of this Agreement,
including the provisions of this sentence, may not be amended, modified or
supplemented, and waivers or consents to departures from the provisions hereof
may not be given, unless the same shall be in writing and signed by the Company
and the Holders of at least two-thirds of the then outstanding Registrable
Securities. Notwithstanding the foregoing, a waiver or consent to depart from
the provisions hereof with respect to a matter that relates exclusively to the
rights of Holders and that does not directly or indirectly affect the rights of
other Holders may be given by Holders of at least a majority of the Registrable
Securities to which such waiver or consent relates; provided, however, that the
provisions of this sentence may not be amended, modified, or supplemented except
in accordance with the provisions of the immediately preceding sentence.

               (b) No Inconsistent Agreements. Neither the Company nor any of
its subsidiaries has entered, as of the date hereof, nor shall the Company or
any of its subsidiaries, on or after the date of this Agreement, enter into any
agreement with respect to its securities, that would have the effect of
impairing the rights granted to the Holders in this Agreement or otherwise
conflicts with the provisions hereof. Except as and to the extent specified in
Schedule 6(b) hereto, neither the Company nor any of its subsidiaries has
previously entered into any

                                      -10-
<PAGE>   11

agreement granting any registration rights with respect to any of its securities
to any Person that have not been satisfied in full.

               (c) No Piggyback on Registrations. Except as and to the extent
specified in Schedule 6(b) hereto, neither the Company nor any of its security
holders (other than the Holders in such capacity pursuant hereto) may include
securities of the Company in the Registration Statement other than the
Registrable Securities, and the Company shall not after the date hereof enter
into any agreement providing any such right to any of its security holders.

               (d) Compliance. Each Holder covenants and agrees that it will
comply with the prospectus delivery requirements of the Securities Act as
applicable to it in connection with sales of Registrable Securities pursuant to
the Registration Statement.

               (e) Discontinued Disposition. Each Holder agrees by its
acquisition of such Registrable Securities that, upon receipt of a notice from
the Company of the occurrence of any event of the kind described in Sections
3(d)(ii), 3(d)(iii), 3(d)(iv), 3(d)(v) or 3(d)(vi), such Holder will forthwith
discontinue disposition of such Registrable Securities under the Registration
Statement until such Holder's receipt of the copies of the supplemented
Prospectus and/or amended Registration Statement contemplated by Section 3(h),
or until it is advised in writing (the "Advice") by the Company that the use of
the applicable Prospectus may be resumed, and, in either case, has received
copies of any additional or supplemental filings that are incorporated or deemed
to be incorporated by reference in such Prospectus or Registration Statement.
The Company may provide appropriate stop orders to enforce the provisions of
this paragraph.

               (f) Piggy-Back Registrations. If at any time during the
Effectiveness Period there is not an effective Registration Statement covering
all of the Registrable Securities and the Company shall determine to prepare and
file with the Commission a registration statement relating to an offering for
its own account or the account of others under the Securities Act of any of its
equity securities, other than on Form S-4 or Form S-8 (each as promulgated under
the Securities Act) or their then equivalents relating to equity securities to
be issued solely in connection with any acquisition of any entity or business or
equity securities issuable in connection with stock option or other employee
benefit plans, then the Company shall send to each Holder written notice of such
determination and, if within fifteen days after receipt of such notice, any such
Holder shall so request in writing, the Company shall include in such
registration statement all or any part of such Registrable Securities such
holder requests to be registered; provided, that, the Company shall not be
required to register any Registrable Securities pursuant to this Section 6(f)
that are eligible for resale pursuant to Rule 144(k) promulgated under the
Securities Act.

               (g) Notices. Any and all notices or other communications or
deliveries required or permitted to be provided hereunder shall be in writing
and shall be deemed given and effective on the earliest of (i) the date of
transmission, if such notice or communication is delivered via facsimile at the
facsimile telephone number specified in this Section prior to 6:30 p.m. (New
York City time) on a Business Day, (ii) the Business Day after the date of

                                      -11-
<PAGE>   12

transmission, if such notice or communication is delivered via facsimile at the
facsimile telephone number specified in this Agreement later than 6:30 p.m. (New
York City time) on any date and earlier than 11:59 p.m. (New York City time) on
such date, (iii) the Business Day following the date of mailing, if sent by
nationally recognized overnight courier service, or (iv) upon actual receipt by
the party to whom such notice is required to be given. The address for such
notices and communications shall be as follows:

        If to the Company:          e.Digital Corporation
                                    13114 Evening Creek Drive South
                                    San Diego, California 92128
                                    Facsimile No.: (858) 486-3922
                                    Attn:  Chief Executive Officer

        With copies to:             Higham, McConnell& Dunning
                                    28202 Cabot Road, Suite 450
                                    Laguna Niguel, California 92677
                                    Facsimile No.: (949) 365-5522
                                    Attn: Curt C. Barwick, Esq.

        If to a Purchaser:          To the address set forth
                                    under such Purchaser's name on the signature
                                    pages hereto.

        If to any other Person who is then the registered Holder:

                                    To the address of such Holder as it appears
                                    in the stock transfer books of the Company

or such other address as may be designated in writing hereafter, in the same
manner, by such Person.

               (h) Successors and Assigns. This Agreement shall inure to the
benefit of and be binding upon the successors and permitted assigns of each of
the parties and shall inure to the benefit of each Holder. The Company may not
assign its rights or obligations hereunder without the prior written consent of
each Holder. Each Holder may assign their respective rights hereunder in the
manner and to the Persons as permitted under the Purchase Agreement.

               (i) Counterparts. This Agreement may be executed in any number of
counterparts, each of which when so executed shall be deemed to be an original
and, all of which taken together shall constitute one and the same Agreement. In
the event that any signature is delivered by facsimile transmission, such
signature shall create a valid binding obligation of the party executing (or on
whose behalf such signature is executed) the same with the same force and effect
as if such facsimile signature were the original thereof.

               (j) Governing Law. All questions concerning the construction,
validity, enforcement and interpretation of this Agreement shall be governed by
and construed and

                                      -12-
<PAGE>   13

enforced in accordance with the internal laws of the State of New York, without
regard to the principles of conflicts of law thereof. Each party hereby
irrevocably submits to the exclusive jurisdiction of the state and federal
courts sitting in the City of New York, borough of Manhattan, for the
adjudication of any dispute hereunder or in connection herewith or with any
transaction contemplated hereby or discussed herein, and hereby irrevocably
waives, and agrees not to assert in any suit, action or proceeding, any claim
that it is not personally subject to the jurisdiction of any such court, that
such suit, action or proceeding is improper. Each party hereby irrevocably
waives personal service of process and consents to process being served in any
such suit, action or proceeding by mailing a copy thereof to such party at the
address in effect for notices to it under this Agreement and agrees that such
service shall constitute good and sufficient service of process and notice
thereof. Nothing contained herein shall be deemed to limit in any way any right
to serve process in any manner permitted by law.

               (k) Cumulative Remedies. The remedies provided herein are
cumulative and not exclusive of any remedies provided by law.

               (l) Severability. If any term, provision, covenant or restriction
of this Agreement is held by a court of competent jurisdiction to be invalid,
illegal, void or unenforceable, the remainder of the terms, provisions,
covenants and restrictions set forth herein shall remain in full force and
effect and shall in no way be affected, impaired or invalidated, and the parties
hereto shall use their reasonable efforts to find and employ an alternative
means to achieve the same or substantially the same result as that contemplated
by such term, provision, covenant or restriction. It is hereby stipulated and
declared to be the intention of the parties that they would have executed the
remaining terms, provisions, covenants and restrictions without including any of
such that may be hereafter declared invalid, illegal, void or unenforceable.

               (m) Headings. The headings in this Agreement are for convenience
of reference only and shall not limit or otherwise affect the meaning hereof.

               (n) Independent Nature of Purchasers' Obligations and Rights. The
obligations of each Purchaser hereunder is several and not joint with the
obligations of any other Purchaser hereunder, and no Purchaser shall be
responsible in any way for the performance of the obligations of any other
Purchaser hereunder. Nothing contained herein or in any other agreement or
document delivered at any closing, and no action taken by any Purchaser pursuant
hereto or thereto, shall be deemed to constitute the Purchasers as a
partnership, an association, a joint venture or any other kind of entity, or
create a presumption that the Purchasers are in any way acting in concert with
respect to such obligations or the transactions contemplated by this Agreement.
Each Purchaser shall be entitled to protect and enforce its rights, including
without limitation the rights arising out of this Agreement, and it shall not be
necessary for any other Purchaser to be joined as an additional party in any
proceeding for such purpose.

                   [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK
                           SIGNATURE PAGES TO FOLLOW]

                                      -13-
<PAGE>   14

               IN WITNESS WHEREOF, the parties have executed this Registration
Rights Agreement as of the date first written above.

                             E.DIGITAL CORPORATION

                             By:
                                ------------------------------------------------
                                    Name:
                                    Title:

                   [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK
                      SIGNATURE PAGE OF PURCHASER FOLLOWS]

                                      -14-
<PAGE>   15

                             MILLENNIUM PARTNERS L.P.

                             By:
                                ------------------------------------------------
                             Name:
                             Title:

                             Address for Notice:

                             Millennium Partners L.P.
                             c/o Millennium Management, L.L.C.
                             666 Fifth Avenue,
                             New York, New York 10103
                             Facsimile No.: (212) 841-6302
                             Attn: Daniel Cardella

                             With copies to:

                             Robinson Silverman Pearce Aronsohn & Berman LLP
                             1290 Avenue of the Americas
                             New York, NY  10104
                             Facsimile No.:  (212) 541-4630 and (212) 541-1432
                             Attn: Eric L. Cohen, Esq.

                                      -15-
<PAGE>   16

                             AIG SOUNDSHORE HOLDINGS LTD.

                             By:
                                ------------------------------------------------
                             Name:
                             Title:

                             Address for Notice:

                             AIG SoundShore Holdings Ltd.
                             c/o AIG SoundShore LLC
                             1281 East Main Street,
                             Stamford, CT 06902
                             Facsimile No.: (203) 324-8498
                             Attn: Michael Hamblett

                             With copies to:

                             Robinson Silverman Pearce Aronsohn & Berman LLP
                             1290 Avenue of the Americas
                             New York, NY  10104
                             Facsimile No.:  (212) 541-4630 and (212) 541-1432
                             Attn: Eric L. Cohen, Esq.

                                      -16-
<PAGE>   17

                      AIG SOUNDSHORE OPPORTUNITY FUND LTD.

                             By:
                                ------------------------------------------------
                             Name:
                             Title:

                             Address for Notice:

                             AIG SoundShore Opportunity Fund Ltd.
                             c/o AIG SoundShore LLC
                             1281 East Main Street,
                             Stamford, CT 06902
                             Facsimile No.: (203) 324-8498
                             Attn: Michael Hamblett

                             With copies to:

                             Robinson Silverman Pearce Aronsohn & Berman LLP
                             1290 Avenue of the Americas
                             New York, NY  10104
                             Facsimile No.:  (212) 541-4630 and (212) 541-1432
                             Attn: Eric L. Cohen, Esq.

                                      -17-
<PAGE>   18

                             AIG SOUNDSHORE STRATEGIC
                             HOLDING FUND LTD

                             By:
                                ------------------------------------------------
                             Name:
                             Title:

                             Address for Notice:

                             AIG SoundShore Strategic Holdings Ltd.
                             c/o AIG SoundShore LLC
                             1281 East Main Street,
                             Stamford, CT 06902
                             Facsimile No.: (203) 324-8498
                             Attn: Michael Hamblett

                             With copies to:

                             Robinson Silverman Pearce Aronsohn & Berman LLP
                             1290 Avenue of the Americas
                             New York, NY  10104
                             Facsimile No.:  (212) 541-4630 and (212) 541-1432
                             Attn: Eric L. Cohen, Esq.

                                      -18-
<PAGE>   19

                             AIG SOUNDSHORE PRIVATE
                             INVESTORS FUND LTD.

                             By:
                                ------------------------------------------------
                             Name:
                             Title:

                             Address for Notice:

                             AIG SoundShore Private Investors Fund Ltd.
                             c/o AIG SoundShore LLC
                             1281 East Main Street,
                             Stamford, CT 06902
                             Facsimile No.: (203) 324-8498
                             Attn: Michael Hamblett

                             With copies to:

                             Robinson Silverman Pearce Aronsohn & Berman LLP
                             1290 Avenue of the Americas
                             New York, NY  10104
                             Facsimile No.:  (212) 541-4630 and (212) 541-1432
                             Attn: Eric L. Cohen, Esq.

                                      -19-
<PAGE>   20

                                                                         Annex A

                              PLAN OF DISTRIBUTION

        The Selling Stockholders and any of their pledgees, assignees and
successors-in-interest may, from time to time, sell any or all of their shares
of Common Stock on any stock exchange, market or trading facility on which the
shares are traded or in private transactions. These sales may be at fixed or
negotiated prices. The Selling Stockholders may use any one or more of the
following methods when selling shares:

-       ordinary brokerage transactions and transactions in which the
        broker-dealer solicits purchasers;

-       block trades in which the broker-dealer will attempt to sell the shares
        as agent but may position and resell a portion of the block as principal
        to facilitate the transaction;

-       purchases by a broker-dealer as principal and resale by the
        broker-dealer for its account;

-       an exchange distribution in accordance with the rules of the applicable
        exchange;

-       privately negotiated transactions;

-       short sales;

-       broker-dealers may agree with the Selling Stockholders to sell a
        specified number of such shares at a stipulated price per share;

-       a combination of any such methods of sale; and

-       any other method permitted pursuant to applicable law.

        The Selling Stockholders may also sell shares under Rule 144 under the
Securities Act, if available, rather than under this prospectus.

        The Selling Stockholders may also engage in short sales against the box,
puts and calls and other transactions in securities of the Company or
derivatives of Company securities and may sell or deliver shares in connection
with these trades. The Selling Stockholders may pledge their shares to their
brokers under the margin provisions of customer agreements. If a Selling
Stockholder defaults on a margin loan, the broker may, from time to time, offer
and sell the pledged shares. The Selling Stockholders have advised the Company
that they have not entered into any agreements, understandings or arrangements
with any underwriters or broker-dealers regarding the sale of their shares other
than ordinary course brokerage arrangements, nor is there an underwriter or
coordinating broker acting in connection with the proposed sale of shares by the
Selling Stockholders.

                                      -20-
<PAGE>   21

        Broker-dealers engaged by the Selling Stockholders may arrange for other
brokers-dealers to participate in sales. Broker-dealers may receive commissions
or discounts from the Selling Stockholders (or, if any broker-dealer acts as
agent for the purchaser of shares, from the purchaser) in amounts to be
negotiated. The Selling Stockholders do not expect these commissions and
discounts to exceed what is customary in the types of transactions involved.

        The Selling Stockholders and any broker-dealers or agents that are
involved in selling the shares may be deemed to be "underwriters" within the
meaning of the Securities Act in connection with such sales. In such event, any
commissions received by such broker-dealers or agents and any profit on the
resale of the shares purchased by them may be deemed to be underwriting
commissions or discounts under the Securities Act.

        The Company is required to pay all fees and expenses incident to the
registration of the shares, including reasonable fees and disbursements of
counsel to the Selling Stockholders. The Company has agreed to indemnify the
Selling Stockholders against certain losses, claims, damages and liabilities,
including liabilities under the Securities Act.

                                      -21-

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