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                                                                    EXHIBIT 10.3

                          REGISTRATION RIGHTS AGREEMENT

         This REGISTRATION RIGHTS AGREEMENT (this "Agreement") is made and
entered into as of the 12th day of May, 2000 by and between HIGH SPEED ACCESS
CORP., a Delaware corporation (the "Company"), CHARTER COMMUNICATIONS, INC., a
Delaware corporation ("Charter"), and CHARTER COMMUNICATIONS HOLDING COMPANY,
LLC, a Delaware limited liability company ("Charter HoldCo").

                                    RECITALS

         WHEREAS, the Company has agreed to grant to Charter and Charter HoldCo
certain registration rights with respect to the capital stock of the Company
owned by Charter and Charter HoldCo, upon the terms and subject to the
conditions set out in this Agreement.

         NOW, THEREFORE, in consideration of the mutual promises and covenants
set forth herein, and for other good and valuable consideration, the receipt and
sufficiency of which is hereby acknowledged, the parties hereto, intending
legally to be bound, agree as follows:

      1. CERTAIN DEFINITIONS. As used in this Agreement, the following terms
shall have the meanings set forth below.

         1.1 "Charter" has the meaning set forth in the first paragraph hereof,
and includes any successor company as may result from any merger or other
business combination or reorganization.

         1.2 "Charter HoldCo" has the meaning set forth in the first paragraph
hereof, and includes any successor company as may result from any merger or
other business combination or reorganization.

         1.3 "Warrant" shall mean the Amended and Restated Securities Purchase
Warrant, dated May 12, 2000, by and between the Company, Charter and Charter
HoldCo.

         1.4 "Common Stock" shall mean the Company's common stock, $0.01 par
value per share, or any capital stock exchanged therefor.

         1.5 "Commission" shall mean the federal Securities and Exchange
Commission or any other federal agency at the time administering the Securities
Act.

         1.6 "Company" has the meaning set forth in the first paragraph hereof,
and includes any successor company as may result from any merger or other
business combination or reorganization.

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         1.7 "Exchange Act" shall mean the Securities Exchange Act of 1934, as
amended, or any similar successor federal statute and the rules and regulations
thereunder, all as the same shall be in effect from time to time.

         1.8 "First Network Services Agreement" shall mean the Network Services
Agreement, dated November 25, 1998, by and between the Company and Charter.

         1.9 "Holder" shall mean Charter, Charter HoldCo and any holder of
Registrable Securities to whom the registration rights conferred by this
Agreement have been transferred in compliance with Section 8 hereof.

         1.10 "Registrable Securities" shall mean (i) any shares of Common Stock
issued to the Holder by the Company, (ii) any shares of Common Stock issuable
upon exercise of warrants held by the Holder, (iii) any shares of Common Stock
or any other capital stock exchanged for Common Stock issued as a dividend or
other distribution with respect to or in exchange for or in replacement of the
shares referenced in (i) or (ii) above, and (iv) all other Common Stock which
the Holder shall have acquired at any time; provided, however, that Registrable
Securities shall not include any shares of Common Stock which have previously
been registered or which have been sold to the public or which have been sold in
a private transaction in which the transferor's rights under this Agreement are
not transferred in accordance with Section 8 hereof.

         1.11 The terms "register," "registered" and "registration" shall refer
to a registration effected by preparing and filing a registration statement in
compliance with the Securities Act and applicable rules and regulations
thereunder, and the declaration or ordering of the effectiveness of such
registration statement.

         1.12 "Registration Expenses" shall mean all expenses incurred in
effecting any registration pursuant to this Agreement, including, without
limitation, all registration, qualification, and filing fees, printing expenses,
escrow fees, fees and disbursements of counsel for the Company, blue sky fees
and expenses, and expenses of any regular or special audits incident to or
required by any such registration, but shall not include Selling Expenses.

         1.13 "Renewal Warrant" shall mean any warrant issued to the Holder
after the date hereof pursuant to the terms of the Systems Access Agreement and
the First Network Services Agreement or pursuant to the terms of the Second
Network Services Agreement.

         1.14 "Rule 144" shall mean Rule 144 as promulgated by the Commission
under the Securities Act, as such Rule may be amended from time to time, or any
similar successor rule that may be promulgated by the Commission.

         1.15 "Rule 145" shall mean Rule 145 as promulgated by the Commission
under the Securities Act, as such Rule may be amended from time to time, or any
similar successor rule that may be promulgated by the Commission.

         1.16 "Second Network Services Agreement" shall mean the Network
Services Agreement, dated May 12, 2000, by and between the Company and Charter.

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         1.17 "Securities Act" shall mean the Securities Act of 1933, as
amended, or any similar successor federal statute and the rules and regulations
thereunder, all as the same shall be in effect from time to time.

         1.18 "Selling Expenses" shall mean all underwriting discounts, selling
commissions and stock transfer taxes applicable to the sale of Registrable
Securities by, and fees and disbursements of counsel for, any Holder (other than
the fees and disbursements of counsel included in Registration Expenses).

         1.19 "Systems Access Agreement" shall mean the Systems Access and
Investment Agreement, dated November 25, 1998, by and among the Company, Vulcan
Ventures, Incorporated and Charter.

      2. COMPANY REGISTRATION.

         2.1 Generally. If the Company shall determine to register any of its
Common Stock for its own account or for the account of any other party, other
than a registration relating solely to employee benefit plans, or a registration
relating solely to a Rule 145 transaction, or a registration on any form of
registration statement that does not permit secondary sales, the Company will:

             [a] promptly give to the Holder written notice thereof and of the
      anticipated effective date of such registration; and

             [b] use its best efforts to include in such registration (and any
      related qualification under blue sky laws or other compliance), except as
      set forth in Section 2.2(b) hereof, and in any underwriting involved
      therein, all the Registrable Securities specified in a written request or
      requests made by the Holder and received by the Company within thirty (30)
      days after the written notice from the Company described in clause [a]
      above is mailed or otherwise delivered by the Company to the Holder in
      accordance with this Agreement. Such written request may specify any or
      part of a Holder's Registrable Securities.

         2.2 Underwriting.

             [a] If the registration of which the Company gives notice is for a
      registered public offering involving an underwriting, the Company shall so
      advise the Holder as a part of the written notice given pursuant to
      Section 2.1(a) hereof. In such event, the right of the Holder to
      registration pursuant to this Section 2 shall be conditioned upon the
      Holder's participation in such underwriting and the inclusion of the
      Holder's Registrable Securities in the underwriting to the extent provided
      herein. The Holder proposing to distribute its securities through such
      underwriting shall (together with the Company and other holders of
      securities of the Company with registration rights to participate therein
      distributing their securities through such underwriting) enter into an
      underwriting agreement in customary form with the representatives of the
      underwriter or underwriters selected by the Company, including customary
      indemnification and contribution agreements.

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             [b] Notwithstanding any other provision of this Section 2, if the
      lead representative of the underwriters advises the Company in writing
      that marketing factors require a limitation on the number of shares to be
      underwritten, the lead representative may (subject to the limitations set
      forth below) exclude all Registrable Securities from, or limit the number
      of Registrable Securities to be included in, the registration and
      underwriting. The Company shall so advise the Holder, and the number of
      shares of securities that are entitled to be included in the registration
      and underwriting shall be allocated first to the Company for securities
      being sold for its own account and thereafter as set forth in Section 10
      hereof.

             [c] If the Holder or any other person requesting inclusion of their
      securities in a registration statement does not agree to the terms of any
      such underwriting, the Holder or such person shall be excluded therefrom
      by written notice from the Company or the lead representative of the
      underwriters. Any Registrable Securities or other securities excluded or
      withdrawn from such underwriting shall be withdrawn from such
      registration. If shares of such other person are so excluded from the
      registration, and if the number of shares of Registrable Securities to be
      included in such registration was previously reduced as a result of
      marketing factors pursuant to Section 2.2(b) hereof, then the Company
      shall offer to the Holder and to other persons who have retained rights to
      include Registrable Securities in the registration the right to include
      additional Registrable Securities in the registration in an aggregate
      amount equal to the number of shares of Registrable Securities so
      excluded, with such shares of Registrable Securities to be allocated in
      accordance with Section 10 hereof.

      3. DEMAND REGISTRATION.

         3.1 Demand for Registration.

             [a] If the Company shall receive from the Holder at any time, or
      from time to time, a written request that the Company effect any
      registration with respect to all or a part of the Registrable Securities,
      the Company will, as soon as practicable, and, in any event, within ninety
      (90) days after the Company's receipt of a written request pursuant to
      this Section 3.1, use its best efforts to effect such registration
      (including, without limitation, filing post-effective amendments,
      appropriate qualifications under applicable blue sky or other state
      securities laws, and appropriate compliance with the Securities Act and
      any other governmental requirements or regulations) as would permit or
      facilitate the sale and distribution of all or such portion of such
      Registrable Securities as are specified in such request. The Holder agrees
      that it will not request registration of less than 250,000 shares of
      Registrable Securities.

             [b] The Company shall not be obligated to effect, or to take any
      action to effect, any such registration pursuant to this Section 3.1:

                 [i] in any particular jurisdiction in which the Company would
          be required to qualify to do business or execute a general consent to
          service of process in effecting such registration, qualification, or
          compliance, unless the

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          Company is already subject to service in such jurisdiction and except
          as may be required by the Securities Act;

                 [ii] after the Company has initiated two such registrations
          pursuant to this Section 3.1 (counting for these purposes only
          registrations which have been declared or ordered effective and
          pursuant to which Registrable Securities requested by Holders to be
          included herein have been sold); and

                 [iii] during the period starting with the date sixty (60) days
          prior to the Company's good faith estimate of the date of filing of a
          registration statement for the account of the Company and ending on a
          date ninety (90) days after the effective date thereof.

             [c] The registration statement filed pursuant to the request of the
      Holder pursuant to this Section 3 may, subject to the provisions of
      Section 3.2 and Section 10 hereof, include other securities of the Company
      with respect to which registration rights have been granted, and may
      include securities of the Company being sold for the account of the
      Company. If the Company shall request inclusion in any registration
      pursuant to this Section 3 of securities being sold for its own account,
      or if other persons shall request inclusion in any registration pursuant
      to this Section 3, the Holder shall offer to include such securities in
      the underwritten offering and may condition such offer on their acceptance
      of the further applicable provisions of this Agreement.

         3.2 Postponed Registration. Subject to clauses [i] through [iii] of
Section 3.1(b) hereof, the Company shall file a registration statement to
register the Registrable Securities requested pursuant to this Section 3 as soon
as practicable, but in any event within ninety (90) days after receipt of the
request of the Holder; provided, however, that if (i) in the good faith judgment
of the Board of Directors of the Company, such registration would be seriously
detrimental to the Company, and the Board of Directors of the Company concludes,
as a result, that it is essential to defer the filing of such registration
statement at such time, and (ii) the Company shall furnish to the Holder a
certificate signed by an executive officer of the Company stating that in the
good faith judgment of the Board of Directors of the Company, it would be
seriously detrimental to the Company for such registration statement to be filed
in the near future and that it is, therefore, essential to defer the filing of
such registration statement, then the Company shall have the right to defer such
filing for a period of not more than ninety (90) days after receipt of the
request of the Holder; provided further, that the Company shall not defer its
obligation in this matter more than once in any 18-month period.

         3.3 Underwriting.

             [a] In connection with any underwriting effected hereunder, the
      Company shall enter into such reasonable agreements (including
      underwriting agreements) and make such representations and warranties and
      take all such other actions in connection therewith in order to expedite
      or facilitate the disposition of the Registrable Securities pursuant to
      any applicable registration statement contemplated herein as may

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      be reasonably requested by the Holder in connection with any sale or
      resale pursuant to any applicable registration statement.

             [b] If the Holder shall request that the registration be in the
      form of a firm commitment underwritten offering, the right of any such
      Holder to registration shall be conditioned upon such Holder's
      participation in such underwriting and the inclusion of such Holder's
      Registrable Securities in the underwriting to the extent provided herein.
      In connection with a firm commitment underwritten offering demanded by the
      Holder, the Company shall, upon request of the Holder, furnish to the
      Holder and each underwriter, upon the effectiveness of the registration
      statement:

                 [i] a certificate, dated such date, signed on behalf of the
          Company by the principal executive officer of the Company, confirming,
          as of the date thereof, that any preliminary prospectus or prospectus
          that is a part of the registration statement as of their respective
          dates do not and will not at any time contain an untrue statement of a
          material fact or omit to state a material fact necessary, in light of
          the circumstances under which they were made, not misleading;

                 [ii] an opinion of counsel for the Company covering matters
          customarily set forth in an underwriting agreement for firm commitment
          underwritten offerings;

                 [iii] a comfort letter from the Company's independent
          accountants, in the customary form and covering matters of the type
          customarily covered by comfort letters to underwriters in connection
          with firm commitment underwritten offerings; and

                 [iv] such other documents and certificates as may be reasonably
          requested by the Holder or the lead representative of the underwriters
          in connection with such firm commitment underwritten offering.

             [c] The Holder may elect to include in such underwritten offering
      all or a part of the Registrable Securities the Holder holds.

             [d] In connection with an underwritten offering hereunder, the
      Company shall (together with the Holder and all other persons proposing to
      distribute their securities through such underwritten offering) enter into
      an underwriting agreement in customary form (including customary
      indemnification and contribution provisions) with the lead representative
      of the underwriter or underwriters selected for such underwriting by the
      Company, which underwriters are reasonably acceptable to the Holder.

             [e] Notwithstanding any other provision of this Section 3, if the
      lead representative of the underwriters advises the Holder in writing that
      marketing factors require a limitation on the number of shares to be
      included in such underwritten offering, the number of shares to be
      included in the underwritten offering shall be allocated first to

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      the Holder, then to the Company for securities being sold for its own
      account, and thereafter as set forth in Section 10 hereof.

             [f] If other persons who have requested inclusion in such
      registration as provided above do not agree to the terms of any such
      underwritten offering, such person shall be excluded therefrom by written
      notice from the Company, the lead representative of the underwriters or
      the Holder. Any Registrable Securities or other securities excluded or
      withdrawn from such underwriting shall be withdrawn from such
      registration. If shares of such other person are so excluded from the
      registration, and if the number of shares of Registrable Securities to be
      included in such registration was previously reduced as a result of
      marketing factors pursuant to Section 3.3(e) hereof, then the Holder shall
      offer to the Company and to other persons who have retained rights to
      include Registrable Securities in the registration the right to include
      additional Registrable Securities in the registration in an aggregate
      amount equal to the number of shares of Registrable Securities so
      excluded, with such shares of Registrable Securities to be allocated in
      accordance with Section 10 hereof.

      4. REGISTRATION EXPENSES. All Registration Expenses incurred in connection
with any registration, qualification or compliance pursuant to Sections 2 and 3
hereof shall be borne by the Company. All Selling Expenses relating to
securities so registered shall be borne by the Company, except that in no event
shall the Company be responsible for payment of the underwriters' discount
and/or selling commissions in connection with the registration of the
Registrable Securities of the Holder.

      5. REGISTRATION PROCEDURES.

         5.1 In the case of each registration effected by the Company pursuant
to this Agreement, the Company will keep the Holder advised in writing as to the
initiation of each registration and as to the material progress and completion
thereof.

         5.2 At its expense, the Company will use its best efforts to:

             [a] keep such registration effective for a period of one hundred
      eighty (180) days or until the Holder has completed the distribution
      described in the registration statement relating thereto; provided,
      however, that such 180-day period shall be extended for a period of time
      equal to the period the Holder refrains from selling any securities
      included in such registration at the request of an underwriter of Common
      Stock (or other securities of the Company);

             [b] prepare and file with the Commission such amendments and
      supplements to such registration statement and the prospectus made a part
      of such registration statement as may be necessary to comply with the
      provisions of the Securities Act with respect to the disposition of all
      securities covered by such registration statement;

             [c] furnish such number of prospectuses and other documents
      incident thereto, including any amendment of or supplement to the
      prospectus, as the Holder from time to time may reasonably request;

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             [d] cause all such Registrable Securities registered pursuant
      hereunto to be listed on each securities exchange, if any, on which
      similar securities issued by the Company are then listed and comply with
      all applicable blue sky laws to enable the Registrable Securities to be
      publicly offered and sold in the states in which such Registrable
      Securities will be offered;

             [e] provide a transfer agent and registrar for all Registrable
      Securities registered pursuant to such registration statement and a CUSIP
      number for all such Registrable Securities, in each case not later than
      the effective date of such registration;

             [f] advise the Holder promptly and, if requested by the Holder,
      confirm such advice in writing:

                 [i] when the prospectus or any prospectus supplement or
          post-effective amendment has been filed and, with respect to any
          applicable registration statement or any post-effective amendment
          thereto, when the same has become effective;

                 [ii] of any request by the Commission for amendments to the
          registration statement or amendments or supplements to the prospectus
          or for additional information relating thereto

                 [iii] of the issuance by the Commission of any stop order
          suspending the effectiveness of the registration statement under the
          Securities Act or of the suspension by any state securities commission
          of the qualification of the Registrable Securities for offering or
          sale in any jurisdiction or the initiation of any proceeding for any
          of the preceding purposes; or

                 [iv] of the existence of any fact or the happening of any event
          that makes any statement of a material fact made in the registration
          statement, the prospectus, any amendment or supplement thereto or any
          document incorporated by reference therein untrue, or that requires
          the making of any additions to or changes in the registration
          statement in order to make the statements therein not misleading, or
          that requires the making of any additions to or changes in the
          prospectus in order to make the statements therein, in the light of
          the circumstances under which they were made, not misleading.

          If at any time the Commission shall issue any stop order suspending
          the effectiveness of the registration statement, or any state
          securities commission or other regulatory authority shall issue an
          order suspending the qualification or exemption from qualification of
          the Registrable Securities under state securities or blue sky laws,
          the Company shall use its best efforts to obtain the withdrawal or
          lifting of such order at the earliest possible time;

             [g] furnish to the Holder, before filing with the Commission,
      copies of any registration statement or any prospectus included therein or
      any amendments or supplements to any such registration statement or
      prospectus (including all documents incorporated by reference after the
      initial filing of such registration statement), which

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      documents will be subject to the review and comment of the Holder for a
      period of at least three (3) business days, and the Company will not file
      any such registration statement or prospectus or any amendment or
      supplement to any such registration statement or prospectus (including all
      such documents incorporated by reference) to which the Holder shall
      reasonably object within three (3) business days after the receipt
      thereof. The Holder shall be deemed to have reasonably objected to such
      filing if such registration statement, amendment, prospectus or supplement
      as applicable, as proposed to be filed, contains a material misstatement
      or omission or fails to comply with the applicable requirements of the
      Securities Act;

             [h] promptly prior to the filing of any document that is to be
      incorporated by reference into a registration statement or prospectus,
      provide copies of such document to the Holder, make the Company's
      representatives available for discussion of such document and other
      customary due diligence matters, and include such information in such
      document prior to the filing thereof as the Holder may reasonable request;

             [i] make available at reasonable times for inspection by the Holder
      and any attorney or accountant retained by the Holder, all financial and
      other records, pertinent corporate documents of the Company and cause the
      Company's officers, directors and employees to supply all information
      reasonably requested by the Holder, attorney or accountant in connection
      with such registration statement or any post-effective amendment thereto
      subsequent to the filing thereof and prior to its effectiveness;

             [j] if requested by the Holder, promptly include in any
      registration statement or prospectus, pursuant to a supplement or
      post-effective amendment if necessary, such information as the Holder may
      reasonably request to have included therein, including, without
      limitation, information relating to the "Plan of Distribution," and make
      all required filings of such prospectus supplement or post-effective
      amendment as soon as practicable after the Company is notified of the
      matters to be included in such prospectus supplement or post-effective
      amendment;

             [k] furnish to the Holder upon its reasonable request, without
      charge, at least one copy of the registration statement, as first filed
      with the Commission, and of each amendment thereto, including all
      documents incorporated by reference therein and all exhibits (including
      exhibits incorporated therein by reference);

             [l] prior to any public offering of Registrable Securities,
      cooperate with the Holder and its counsel in connection with the
      registration and qualification of the Registrable Securities under the
      securities or blue sky laws of such jurisdictions as the Holder may
      request and do any and all other acts or things reasonably necessary or
      advisable to enable the disposition in such jurisdictions of the
      Registrable Securities covered by the applicable registration statement;
      provided, however, that the Company shall not be required to register or
      qualify as a foreign corporation where it is not now so qualified or to
      take any action that would subject it to the service of process in suits
      or to taxation, other than as to matters and transactions relating to the
      registration statement, in any jurisdiction where it is not now so
      subject;

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             [m] use its reasonable best efforts to cause the disposition of the
      Registrable Securities covered by the registration statement to be
      registered with or approved by such other governmental agencies or
      authorities as may be necessary to enable the seller or sellers thereof to
      consummate the disposition of such Registrable Securities;

             [n] comply with all applicable rules and regulations of the
      Commission, and make generally available to the Holder with regard to any
      applicable registration statement, as soon as practicable, a consolidated
      earnings statement meeting the requirements of Rule 158 under the
      Securities Act (which need not be audited) covering a 12-month period
      beginning after the effective date of the registration statement (as such
      term is defined in paragraph (c) of Rule 158 under the Securities Act);
      and

             [o] make appropriate officers of the Company available to the
      Holder for meetings with prospective purchasers of the Registrable
      Securities and prepare and present to potential investors customary "road
      show" material in a manner consistent with other new issuances of other
      securities similar to the Registrable Securities.

      6. INDEMNIFICATION.

         6.1 The Company will indemnify the Holder, its officers, directors,
employees, agents and representatives, and each underwriter, if any, and each
person who controls (within the meaning of Section 15 of the Securities Act) the
Holder or any such underwriter, against all expenses, claims, losses, damages,
and liabilities (or actions, proceedings, or settlements in respect thereof),
arising out of or based on any untrue statement (or alleged untrue statement) of
a material fact contained in any prospectus, offering circular, or other
document (including any related registration statement, notification, or the
like) incident to any such registration, qualification, or compliance, or based
on any omission (or alleged omission) to state therein a material fact required
to be stated therein or necessary to make the statements therein not misleading,
or any violation by the Company of the Securities Act or any applicable state
securities laws, or any rules or regulations thereunder applicable to the
Company and relating to action or inaction required of the Company in connection
with any such registration, qualification, or compliance, and will reimburse the
Holder, its officers, directors, employees, agents and representatives, and each
such underwriter, and each such person who controls the Holder and any such
underwriter, for any legal and any other expenses reasonably incurred in
connection with investigating and defending or settling any such claim, loss,
damage, liability or action, as such expenses are incurred; provided, that the
Company will not be liable in any such case to the extent that any such claim,
loss, damage, liability, or expense arises out of or is based on any untrue
statement or omission based upon written information furnished to the Company by
the Holder or underwriter and stated to be specifically for use therein. It is
agreed that the indemnity agreement contained in this Section 6.1 shall not
apply to amounts paid in settlement of any such loss, claim, damage, liability
or action if such settlement is effected without the written consent of the
Company (which consent shall not be unreasonably withheld). The foregoing
indemnity agreement is in addition to any liability which the Company may
otherwise have to the Holder or to any such officer, director, employee, agent,
representative, underwriter or control person.

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         6.2 The Holder will, if Registrable Securities held by the Holder are
included in the securities as to which such registration, qualification, or
compliance is being effected, indemnify the Company, its officers, directors,
employees, agents and representatives, and each underwriter, if any, of the
Company's securities covered by such a registration statement, and each person
who controls (within the meaning of Section 15 of the Securities Act) the
Company or any such underwriter, against all claims, losses, damages and
liabilities (or actions in respect thereof) arising out of or based on any
untrue statement (or alleged untrue statement) of a material fact contained in
any such registration statement, prospectus, offering circular, or other
document, or any omission (or alleged omission) to state therein a material fact
required to be stated therein or necessary to make the statements therein not
misleading and will reimburse the Company, its officers, directors, employees,
agents and representatives, and each such underwriter, and each such person who
controls the Company and any such underwriter, for any legal or any other
expenses reasonably incurred in connection with investigating or defending any
such claim, loss, damage, liability, or action, in each case to the extent, but
only to the extent, that such untrue statement (or alleged untrue statement) or
omission (or alleged omission) is made in such registration statement,
prospectus, offering circular, or other document in reliance upon and in
conformity with written information furnished to the Company by the Holder and
stated to be specifically for use therein; provided, however, that the
obligations of the Holder hereunder shall not apply to amounts paid in
settlement of any such claims, losses, damages, or liabilities (or actions in
respect thereof) if such settlement is effected without the written consent of
the Holder (which consent shall not be unreasonably withheld); provided further,
that in no event shall any indemnity obligation under this Section 6.2 exceed
the gross proceeds from the offering received by the Holder with respect to its
sale of Registrable Securities pursuant to the prospectus, less the amount of
any damages that the Holder has otherwise been required to pay by reason of such
untrue statement or alleged untrue statement or omission or alleged omission.
The foregoing indemnity agreement is in addition to any liability which the
Holder may otherwise have to the Company or any such officer, director,
employee, agent, representative, underwriter or control person.

         6.3 Promptly after receipt by an indemnified party under Section 6.1 or
6.2 hereof of notice of the commencement of any action, such indemnified party
shall, if a claim in respect thereof is to be made against the indemnifying
party under such section, notify each party against whom indemnification is to
be sought in writing of the commencement thereof (but the failure to so notify
an indemnifying party shall not relieve the indemnifying party from any
liability which it may have under this Section 6). In case any such action is
brought against any indemnified party, and it notifies an indemnifying party of
the commencement thereof, the indemnifying party will be entitled to participate
therein, and to the extent it may elect by written notice delivered to the
indemnified party promptly after receiving the aforesaid notice from such
indemnified party, to assume the defense thereof with counsel satisfactory to
such indemnified party. Notwithstanding the foregoing, the indemnified party or
parties shall have the right to employ its or their own counsel in any such
case, but the fees and expenses of such counsel shall be at the expense of such
indemnified party or parties unless (i) the employment of such counsel shall
have been authorized in writing by one of the indemnifying parties in connection
with the defense of such action, (ii) the indemnifying parties shall not have
employed counsel to have charge of the defense of such action within a
reasonable time after notice of commencement of the action, or (iii) such
indemnified party or parties shall have reasonably concluded that there may be
defenses available to it or them which are different from or additional to those
available

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to one or all of the indemnifying parties (in which case the indemnifying
parties shall not have the right to direct the defense of such action on behalf
of the indemnified party or parties), in any of which events such fees and
expenses shall be borne by the indemnifying parties. Anything in this Section
6.3 to the contrary notwithstanding, an indemnifying party shall not be liable
for any settlement or any claim or action effected without its written consent;
provided, however, that such consent shall not be unreasonably withheld.

         6.4 If the indemnification provided for in this Section 6 is for any
reason unavailable to an indemnified party with respect to any loss, liability,
claim, damage, or expense referred to herein, then the indemnifying party, in
lieu of indemnifying such indemnified party hereunder, shall contribute to the
amount paid or payable by such indemnified party, as a result of such loss,
liability, claim, damage or expense, in such proportion as IS appropriate to
reflect the relative fault of the indemnifying party on the one hand and of the
indemnified party on the other in connection with the statements or omissions of
the indemnifying party and of the indemnified party. Such relative fault shall
be determined by reference to, among other things, whether the untrue or alleged
untrue statement of a material fact or the omission to state a material fact
relates to information supplied by the indemnifying party or by the indemnified
party, and the parties' relative intent, knowledge, access to information, and
opportunity to correct or prevent such statement or omission; provided, that in
no event shall contribution by the Holder under this Section 6.4 exceed the
gross proceeds from the offering received by the Holder.

         6.5 Notwithstanding the foregoing, to the extent that the provisions on
indemnification and contribution contained in the underwriting agreement entered
into in connection with the underwritten offering are in conflict with the
foregoing provisions, the provisions in the underwriting agreement shall
control.

      7. INFORMATION BY HOLDER. The Holder shall furnish to the Company such
information regarding the Holder and the distribution proposed by the Holder as
the Company may reasonably request in writing and as shall be reasonably
required in connection with any registration, qualification, or compliance
referred to in this Agreement.

      8. TRANSFER OR ASSIGNMENT OF REGISTRATION RIGHTS. The rights to cause the
Company to register securities granted to the Holder by the Company under
Section 2 hereof, or the right to demand that the Company register securities
granted under Section 3 hereof, may be transferred or assigned by the Holder
only to a transferee or assignee of not less than 10,000 shares of Registrable
Securities (as presently constituted and subject to subsequent adjustments for
stock splits, stock dividends, reverse stock splits, and the like); provided,
however, that the Company is given written notice at the time of or within a
reasonable time after said transfer or assignment, stating the name and address
of the transferee or assignee and identifying the securities with respect to
which such registration rights are being transferred or assigned; provided
further, that the transferee or assignee of such rights assumes in writing the
obligations of the Holder under this Agreement.

                                       12
<PAGE>   13

      9.  "MARKET STAND-OFF" AGREEMENT.

          9.1 If requested by the Company and the lead representative of the
underwriters of Common Stock (or other securities of the Company), neither the
Holder, nor any officer or director of the Company or holder of more than five
percent (5%) of the outstanding capital stock of the Company, shall sell or
otherwise transfer or dispose of any Common Stock (or other securities) of the
Company held by such person (other than those included in the registration)
during a period of up to ninety (90) days following the effective date of a
registration statement of the Company filed under the Securities Act; provided,
that such agreement shall only apply to the first such registration statement of
the Company that includes securities to be sold on its behalf to the public in
an underwritten offering.

          9.2 The obligations described in this Section 9 shall not apply to a
registration relating solely to employee benefit plans on Form S-1 or Form S-8
or similar forms that may be promulgated in the future, or a registration
relating solely to a Rule 145 transaction on Form S-4 or similar forms that may
be promulgated in the future. The Company may impose stop-transfer instructions
with respect to the shares (or securities) subject to the foregoing restriction
until the end of said 180-day period.

      10. ALLOCATION OF REGISTRATION OPPORTUNITIES. In any circumstance in which
all of the Registrable Securities and/or other shares of Common Stock with
registration rights (the "Other Shares") requested to be included in a
registration on behalf of the Holder and/or other persons cannot be so included
as a result of limitations of the aggregate number of shares of Registrable
Securities and/or Other Shares that may be so included, the number of shares of
Registrable Securities and/or Other Shares that may be so included shall be
allocated among the Holder and/or the other persons requesting inclusion of
shares pro rata on the basis of the number of shares of Registrable Securities
and/or Other Shares that would be held by the Holder and/or the other persons.
If the Holder and/or the other persons do not request inclusion of the maximum
number of shares of Registrable Securities and/or Other Shares allocated to them
pursuant to the above-described procedure, the remaining portion of this
allocation shall be reallocated among the Holder and/or the other persons whose
allocations did not satisfy their requests pro rata on the basis of the number
of shares of Registrable Securities and/or Other Shares that would be held by
the Holder and/or the other persons and this procedure shall be repeated until
all of the shares of Registrable Securities and Other Shares which may be
included in the registration on behalf of the Holder and/or the other persons
have been so allocated. The Company shall not limit the number of Registrable
Securities to be included in a registration pursuant to this Agreement in order
to include shares held by persons with no registration rights.

      11. LIMITATIONS ON REGISTRATION OF OTHER SECURITIES. From and after the
date of this Agreement, the Company shall not, without the prior written consent
of the Holder, enter into any agreement with any holder or prospective holder of
any securities of the Company giving such holder or prospective holder any
registration rights the terms of which are as or more favorable than
registration rights granted to the Holder hereunder unless the Company shall
also give such favorable rights to the Holder hereunder.

                                       13
<PAGE>   14

      12. REPORTING.

          12.1 The Company agrees, when required by law, to make and keep public
information available, as those terms are understood and defined in Rule 144, at
all times.

          12.2 The Company hereby represents and warrants that all reports and
other documents required to be filed by the Company with the Commission under
the Securities Act and the Exchange Act, as of the date hereof, have been filed.
The Company will use its best efforts to file with the Commission, in a timely
manner, all reports and other documents required to be filed by the Company
under the Securities Act and the Exchange Act after the date hereof.

          12.3 The Company will provide written evidence of compliance with
Section 12.1 hereof and the filing of all reports contemplated by Section 12.2
hereof to the Holder promptly upon receipt of a written request for such
evidence from the Holder.

      13. TERMINATION OF REGISTRATION RIGHTS. The right of the Holder to request
registration or inclusion in any registration pursuant to Section 2 hereof shall
terminate on the closing of the first Company initiated registered public
offering of Common Stock if all shares of Registrable Securities held or
entitled to be held upon conversion or exercise by the Holder may immediately be
sold under Rule 144 during any 90-day period, or on such date after the closing
of the first Company initiated registered public offering of Common Stock if all
shares of Registrable Securities held or entitled to be held upon conversion or
exercise by the Holder may immediately be sold under Rule 144 during any 90-day
period; provided, however, that the provisions of this Section 13 shall not
apply to the Holder if and when it owns more than five percent (5%) of the
Company's outstanding stock until such time as the Holder owns less than five
percent (5%) of the outstanding stock of the Company.

      14. TERMINATION OF PRIOR REGISTRATION RIGHTS. Any registration rights
granted to the Holder prior to the date hereof concerning any Registrable
Securities held by the Holder, whether by written agreement or otherwise, are
hereby terminated and superseded by this Agreement. This Agreement shall be
deemed to amend and restate any such prior agreements granting such registration
rights, but only to the extent of Registrable Securities held by the Holder.

      15. MISCELLANEOUS.

          15.1 Governing Law. This Agreement shall be governed in all respects
by the laws of the State of Delaware, without giving effect to the principles of
conflicts of laws thereof.

          15.2 Successors and Assigns. Except as otherwise expressly provided
herein, the provisions hereof shall inure to the benefit of, and be binding
upon, the successors, assigns, heirs, executors and administrators of the
parties hereto.

          15.3 Entire Agreement; Amendment; Waiver. This Agreement, together
with the Warrant and any Renewal Warrants provided for in connection with the
Systems Access Agreement, the First Network Services Agreement and the Second
Network Services Agreement, constitutes the full and entire understanding and
agreement between the parties with

                                       14
<PAGE>   15

regard to the registration rights of the Holder. Neither this Agreement nor any
term hereof may be amended, waived, discharged or terminated, except with the
consent of the parties.

          15.4 Notices. All notices, requests, consents, and other
communications under this Agreement shall be in writing and shall be mailed by
first class, registered, or certified mail, postage prepaid, or sent via
overnight reputable courier service, or delivered personally or via facsimile
with copy sent by mail as provided above:

          If to Charter or
           Charter Holdco:        Charter Communications, Inc.
                                  12444 Powerscourt Drive
                                  St. Louis, Missouri 63131
                                  Facsimile: (314) 965-8793
                                  Attention: Curtis S. Shaw, Esq.

          If to the Company:      High Speed Access Corp.
                                  1000 West 10th Street, Suite 210
                                  Louisville, Kentucky 40210
                                  Facsimile: (502) 515-3101
                                  Attention: John G. Hundley, Esq.

or to such other address of which the addressee shall have notified the sender
in writing. Notices mailed in accordance with this Section 15.4 shall be deemed
given (i) if by mail, three (3) days after being mailed, (ii) if by overnight
courier service, one (1) day after being placed in the hands of a representative
of such service and (iii) if by facsimile, on the date of transmission, subject
to sender's receipt of a confirmation copy.

         15.5 Delays or Omissions. No delay or omission to exercise any right,
power or remedy accruing to the Holder, upon any breach or default of the
Company under this Agreement shall impair any such right, power or remedy of the
Holder, nor shall it be construed to be a waiver of any such breach or default,
or an acquiescence therein, or of or in any similar breach or default thereafter
occurring; nor shall any waiver of any single breach or default be deemed a
waiver of any other breach or default theretofore or thereafter occurring. Any
waiver, permit, consent or approval of any kind or character on the part of the
Holder of any breach or default under this Agreement or any waiver on the part
of the Holder of any provisions or conditions of this Agreement must be made in
writing and shall be effective only to the extent specifically set forth in such
writing. All remedies, either under this Agreement or by law or otherwise
afforded to the Holder, shall be cumulative and not alternative.

         15.6 Rights; Separability. Unless otherwise expressly provided herein,
the Holder's rights hereunder are several rights, not rights jointly held with
any other person who holds securities with registration rights. In case any
provision of this Agreement shall be invalid, illegal or unenforceable, the
validity, legality and enforceability of the remaining provisions shall not in
any way be affected or impaired thereby.

                                       15
<PAGE>   16

         15.7 Titles and Subtitles. The titles of the sections and subsections
of this Agreement are for convenience of reference only and are not to be
considered in construing or interpreting this Agreement.

         15.8 Counterparts. This Agreement may be executed in any number of
counterparts, each of which shall be an original, but all of which together
shall constitute one instrument.

         15.9 Prevailing Party. In the event any legal action or other
proceeding is brought by a party hereto to enforce the terms of this Agreement,
the substantially prevailing party in such action or proceeding will be entitled
to reasonable attorneys', paralegals' and accountants' fees and costs incurred
before and at trial and at all appellate levels, in addition to all awards,
judgements and recoveries of damages obtained.

                     [THIS SPACE INTENTIONALLY LEFT BLANK.]

                                       16
<PAGE>   17

        IN WITNESS WHEREOF. the parties hereto have executed this Agreement
effective as of the day and year first written above.

                                          HIGH SPEED ACCESS CORP.

                                          By: /s/ High Speed Access Corp.
                                             -----------------------------------
                                              Name:
                                              Title:

                                          CHARTER COMMUNICATIONS, INC.

                                          By: /s/ Charter Communications, Inc.
                                             -----------------------------------
                                              Name:
                                              Title:

                                          CHARTER COMMUNICATIONS
                                            HOLDING COMPANY, LLC

                                          By: CHARTER COMMUNICATIONS, INC.,
                                                its, Manager

                                          By: /s/ Charter Communications, Inc.
                                             -----------------------------------
                                              Name:
                                              Title:

                                       17<PAGE>   1

                                                                   EXHIBIT 10.4

                            STOCK PURCHASE AGREEMENT

                  THIS STOCK PURCHASE AGREEMENT is made as of the 3rd day of
May, 2000, by and between HIGH SPEED ACCESS CORP., a Delaware corporation (the
"Company") and LUCENT TECHNOLOGIES INC., a Delaware corporation (the
"Investor").

                  WHEREAS, the Investor wishes to purchase from the Company,
and the Company wishes to sell to the Investor, 1,250,000 shares of the
Company's Common Stock of an aggregate purchase price of Ten Million Dollars
($10,000,000), on the terms set forth herein.

                  NOW, THEREFORE, THE PARTIES HEREBY AGREE AS FOLLOWS:

1.       Purchase and Sale of Stock.

         1.1 Sale and Issuance of Stock. Subject to the terms and conditions of
this Agreement, the Company agrees to sell to the Investor and the Investor
agrees to purchase from the Company 1,250,000 shares of Common Stock from the
Company (the "Stock") at a price per share of Common Stock equal to $8.00, for
an aggregate purchase price equal to Ten Million Dollars ($10,000,000), having
the rights, preferences, privileges and restrictions set forth in the Amended
and Restated Certificate of Incorporation of the Company (the "Restated
Certificate").

         1.2 The Closing. The purchase and sale of the Stock shall be held at
the Company's offices within five (5) business days after the satisfaction or
waiver of each of the conditions set forth in Sections 4 and 5 (the "Closing").
At the Closing, the Company will deliver the Stock to the Investor against
payment of the purchase price therefor by check payable to the order of the
Company or by wire transfer.

2.       Representations and Warranties of the Company. The Company hereby
represents and warrants to the Investor that:

         2.1 Organization and Good Standing. The Company is a corporation duly
organized, validly existing and in good standing under the laws of the State of
Delaware and has all requisite corporate power and authority to carry on its
business as now conducted.

         2.2 Authorization. All corporate action on the part of the Company,
its officers, directors and shareholders necessary for the authorization,
execution and delivery of this Agreement, the performance of all obligations of
the Company hereunder, and the authorization, issuance and delivery of the
Stock has been taken or will be taken prior to the Closing, subject to laws of
general application relating to bankruptcy, insolvency and the relief of
debtors and by general principles of equity.

                                       1
<PAGE>   2

         2.3 Valid Issuance of Stock. The Stock, when issued, sold and
delivered in accordance with the terms hereof for the consideration expressed,
will be duly and validly issued, fully paid and nonassessable and, based in
part upon the representations of the Investor in this Agreement, will be issued
in compliance with all applicable federal and state securities laws.

         2.4 Litigation. There are no actions, proceedings or investigations
pending or, to the best of Company's knowledge, any basis therefor or threat
thereof, against or affecting the Company, that, either in any case or in the
aggregate, would result in any material adverse change in the business,
financial condition, or results of operations of the Company.

         2.5 Properties. To the best of the Company's knowledge (but without
having conducted any special investigation), the Company has (i) good and
marketable title to its properties and assets and has good title to all its
leasehold interests, and (ii) sufficient title, license and/or ownership of all
patents, trademarks, service marks, trade names, copyrights, trade secrets,
information, proprietary rights and processes necessary for its business as now
conducted on the date hereof.

         2.6 Compliance with Other Documents. The execution and delivery of
this Agreement, consummation of the transactions contemplated hereby, and
compliance with the terms and provisions hereof will not conflict with or
result in a breach of the terms and conditions of, or constitute a default
under the Restated Certificate or Bylaws of the Company or of any contract or
agreement to which the Company is now a party, except where such conflict,
breach or default of any such contract or agreement, either individually or in
the aggregate, would not have a material adverse effect on the Company's
business, financial condition or results of operations.

         2.7 SEC Filings. Since June 4, 1999 (the "IPO Date"), the Company has
filed with the Securities and Exchange Commission (the "SEC") all reports,
schedules, forms, statements and other documents (including exhibits and all
other information incorporated therein) required to be filed under the
Securities Act and the Exchange Act (the "SEC Documents"). As of their
respective dates, the SEC Documents have complied in all material respects with
the requirements of the Securities Act or the Exchange Act, as the case may be,
and the rules and regulations of the SEC promulgated thereunder applicable to
such SEC Documents and, except to the extent that information contained in any
SEC Document has been revised or superseded by a later filed SEC Document, 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. The financial
statements of the Company included in the SEC Documents comply as to form, as
of their respective dates of filing with the SEC, in all material respects with
applicable accounting requirements and the published rules and regulations of
the SEC with respect thereto, have been prepared in accordance with generally
accepted accounting principles (except, in the case of unaudited statements, as
permitted by Form 10-Q of the SEC) applied on a consistent basis during the
periods involved (except as may be indicated in the notes thereto) and fairly
present in all

                                       2
<PAGE>   3

material respects the consolidated financial position of the Company and its
consolidated Subsidiaries as of the dates thereof and the consolidated results
of their operations and cash flows for the periods then ended (subject, in the
case of unaudited statements, to normal recurring year-end audit adjustments).

3.       Representations and Warranties of the Investor. The Investor hereby
represents and warrants that:

         3.1 Authorization. This Agreement constitutes the valid and legally
binding obligation of the Investor, enforceable in accordance with its terms,
subject to laws of general application relating to bankruptcy, insolvency and
the relief of debtors and by general principles of equity.

         3.2 Investigation. The Investor acknowledges that it has had an
opportunity to discuss the business, affairs and current prospects of the
Company with the Company's executive officers. The Investor further
acknowledges having had access to information about the Company that it has
requested or considers necessary for purposes of purchasing the Stock.

         3.3 Accredited Investor. The Investor is an "accredited investor" as
such term is defined in Regulation D adopted by the SEC.

         3.4 Purchase Entirely for Own Account. This Agreement is made with the
Investor in reliance upon the Investor's representation to the Company, which
by the Investor's execution of this Agreement the Investor hereby confirms,
that the Stock will be acquired for investment for the Investor's own account,
not as a nominee or agent, and not with a view to the resale or distribution of
any part thereof, and that the Investor has no present intention of selling,
granting any participation in, or otherwise distributing the same.

4.       Conditions to the Investor's Obligation at Closing. The obligation of
the Investor to purchase the Stock at the Closing is subject to the fulfillment
to the Investor's satisfaction on or prior to the Closing of the following
conditions:

         4.1 Representations and Warranties. The representations and warranties
made by the Company in Section 2 hereof shall be true and correct when made,
and shall be true and correct as of the Closing with the same force and effect
as if they had been made on and as of such date, subject to changes
contemplated by this Agreement.

         4.2 Securities Laws. The offer and sale of the Stock to the Investor
pursuant to this Agreement shall be either (i) registered under the Securities
Act, or (ii) exempt from the registration requirements of the Securities Act
and the registration and/or qualification requirements of all applicable state
securities laws.

         4.3 Authorizations. All authorizations, approvals or permits, if any,
of any governmental authority or regulatory body that are required in
connection with the lawful issuance and sale of the Stock pursuant to this
Agreement (including, if applicable, the

                                       3
<PAGE>   4

expiration of any waiting period under the Hart-Scott-Rodino Antitrust
Improvements Act of 1976, as amended (the "HSR Act")) shall have been duly
obtained and shall be effective on and as of the Closing.

5.       Conditions to the Company's Obligations at Closing. The obligation of
the Company to sell the Stock at the Closing is subject to the fulfillment to
the Company's satisfaction on or prior to the Closing of the following
conditions:

         5.1 Representations and Warranties. The representations and warranties
of the Investor contained in Section 3 hereof shall be true as of the Closing
with the same force and effect as if they had been made on and as of such date,
subject to changes contemplated by this Agreement.

         5.2 Securities Laws. The offer and sale of the Stock to the Investor
pursuant to this Agreement shall be either (i) registered under the Securities
Act, or (ii) exempt from the registration requirements of the Securities Act
and the registration and/or qualification requirements of all applicable state
securities laws.

         5.3 Authorizations. All authorizations, approvals or permits, if any,
of any governmental authority or regulatory body that are required in
connection with the lawful issuance and sale of the Stock pursuant to this
Agreement (including, if applicable, the expiration of any waiting period under
the HSR Act) shall have been duly obtained and shall be effective on and as of
the Closing.

         5.4 Payment of Purchase Price. The Investor shall have delivered to
the Company the purchase price for the Stock as set forth in Section 1.2
hereof.

6.       Covenants of the Company and the Investor.

         6.1 Agreement Not to Transfer.

         (a)      Prior to the first anniversary of the Closing, the Investor
                  shall not, directly or indirectly, Transfer or offer to
                  Transfer, in the aggregate, more than fifty percent (50%) of
                  the shares of the Stock during any one calendar quarter.

         (b)      Notwithstanding the foregoing restrictions on Transfer (the
                  "Transfer Restrictions"), the Transfer Restrictions shall be
                  ineffective in the event an unrelated third party has
                  publicly announced and is actively pursuing the purchase of
                  all or substantially all of the assets or capital stock of
                  the Company or a merger in which the Company would not be the
                  surviving corporation; provided, that if such acquisition or
                  merger is not consummated within sixty days of such public
                  announcement, the Transfer Restrictions shall be reinstated.

                                       4
<PAGE>   5

         (c)      In order to enforce the Transfer Restrictions, the Company
                  may impose stop-transfer instructions with respect to the
                  Stock until the end of the restricted period.

         (d)      As used in this Agreement, the term "Transfer" shall mean any
                  sale, transfer, assignment, hypothecation, encumbrance or
                  other disposition, whether voluntary or involuntary, of
                  shares of the Stock. In the case of a hypothecation, the
                  Transfer shall be deemed to occur both at the time of the
                  initial pledge and at any pledgee's sale or a sale by any
                  secured creditor or a retention by the secured creditor of
                  the pledged shares of the Stock in complete or partial
                  satisfaction of the indebtedness for which the shares of the
                  Stock are security.

         6.2 Market Stand-Off. In addition to the Transfer Restrictions (which
shall in no way be limited by the following), in connection with any secondary
underwritten public offering by the Company of its equity securities pursuant
to an effective registration statement filed under the Securities Act, the
Investor shall not Transfer or offer to Transfer any shares of the Stock
without the prior written consent of the Company and its underwriters. Such
restriction (the "Market Stand-Off") shall be in effect for such period of time
from and after the effective date of the final prospectus for the offering as
may be requested by the Company or such underwriters; provided, however, that
(i) such Market Stand-Off shall not exceed one hundred eighty (180) days, and
(ii) the Investor shall be subject to the Market Stand-Off only if the officers
and directors of the Company are also subject to similar restrictions. In order
to enforce the Market Stand-Off, the Company may impose stop-transfer
instructions with respect to the Stock until the end of the applicable
stand-off period.

         6.3 Notice of Intention to Transfer. On or prior to the third
anniversary of the Closing, in the event the Investor plans to Transfer in the
aggregate more than twenty percent (20%) of the shares of the Stock in one or
more transactions during any three (3) month period, the Investor shall use its
best efforts to inform the Company of such intention to Transfer such shares
ten (10) days prior to such Transfer.

         6.4 Standstill. The Investor agrees that, prior to the third
anniversary of the IPO Date, unless specifically invited by the Company, the
Investor will not, in any manner, directly or indirectly, effect any
acquisition of Voting Securities (as hereinafter defined), or beneficial
ownership thereof if, immediately after any such acquisition, the Investor
would beneficially own, in the aggregate, Voting Securities representing more
than ten percent (10%) of the outstanding Common Stock of the Company. The
Investor also agrees during such period not to make any public request (or
publicize any request) of the Company (or its directors, officers, employees or
agents), directly or indirectly, to amend or waive any provision of this
Section 6.4 (including this sentence). The Investor also agrees not to form,
join or in any way participate in a "group" (as defined under the Securities
Exchange Act of 1934, as amended (the "Exchange Act")), or take any other
action, in order to circumvent the provisions of this Section 6.4.

                                       5
<PAGE>   6

                  For purposes of this Agreement, (i) the term "Voting
Securities" shall refer to all securities of the Company entitled to vote
generally for the election of directors, and (ii) the term "beneficial
ownership" shall have the meaning set forth in Rule 13d-3 under the Exchange
Act.

                  The restrictions set forth in this Section 6.4 shall be
ineffective upon the occurrence of either of the following events: (i) an
unrelated third party has publicly announced and is actively pursuing the
purchase of all or substantially all of the assets or capital stock of the
Company or a merger in which the Company would not be the surviving
corporation; or (ii) an officer of the Company, duly authorized by the
Company's Board of Directors, has informed the Investor in writing of the
Company's potential interest in entering into a sale of all or substantially
all of its assets or stock or a merger in which the Company would not be the
surviving corporation; provided, however, that if such acquisition, merger or
sale is not consummated within sixty days of such public announcement (in the
case of clause (i)) or of such notice in writing (in the case of clause (ii)),
the restrictions set forth in this Section 6.4 shall be reinstated.

         6.5 Voting Agreements. For a period ending on the seventh anniversary
of the Closing, the Investor agrees to vote all shares of Voting Securities
owned by it (i) in each election of directors for the entire slate of nominees
recommended by the Company's Board of Directors to the Company's shareholders
and (ii) on all other matters to be voted on by holders of Voting Securities,
unless the Company otherwise consents in writing, in the same proportion as the
votes cast by all other shareholders of the Company entitled to vote on such
matter (other than the Investor). The Investor, as a holder of Voting
Securities, shall be present, in person or by proxy, at all meetings of
shareholders of the Company so that all shares of Voting Securities
beneficially owned by it may be counted for the purpose of determining the
presence of a quorum at such meetings.

                  The voting agreements set forth in this Section 6.5 shall
terminate immediately if an unrelated third party has publicly announced and is
actively pursuing the purchase of all or substantially all of the assets or
capital stock of the Company or a merger in which the Company would not be the
surviving corporation; provided, however, that if such acquisition, merger or
sale is not consummated within sixty days of such public announcement, the
voting agreements set forth in this Section 6.5 shall be reinstated.

         6.6 Hart-Scott-Rodino. The Company and the Investor will assist and
cooperate with each other regarding any filings required under the HSR Act and
any other applicable laws and regulations. The Company and the Investor each
agree to make any HSR Act and other filings promptly upon the other's request.

         6.7 Registration of Stock. The Company agrees that, upon request by
the Investor on or after June 3, 2000, it will effect registration of the Stock
in accordance with the provisions contained in Exhibit A attached hereto. The
Investor understands and agrees that (i) the Stock will be characterized as
"restricted securities" under the federal securities laws inasmuch as it is
being acquired from the Company in a transaction not involving a public
offering and that under such laws and applicable regulations such securities
may be resold

                                       6
<PAGE>   7

without registration under the Securities Act only in certain limited
circumstances, and (ii) each certificate representing the Stock and any other
securities issued in respect of the Stock upon any stock split, stock dividend,
recapitalization, merger or similar event (unless no longer required in the
opinion of counsel for the Company) shall be stamped or otherwise imprinted
with appropriate legends mandated by federal and state securities laws.

7.       Miscellaneous.

         7.1 Governing Law. This Agreement shall be governed in all respects by
the laws of the State of Delaware without regard to the conflict of law
provisions thereof.

         7.2 Survival; Additional Securities. The representations and
warranties set forth in Sections 2 and 3 shall survive until the Closing. The
covenants and agreements set forth in Section 6 shall survive in accordance
with their terms. Any new, substituted or additional securities which are by
reason of any stock split, stock dividend, recapitalization or reorganization
distributed with respect to the Stock ("Stock Distributions") shall be
immediately subject to the covenants and agreements set forth in Section 6 to
the same extent the Stock is at such time covered by such provisions.

         7.3 Successors and Assigns. Except as otherwise expressly provided
herein, the provisions hereof shall inure to the benefit of, and be binding
upon, the respective successors and assigns of the parties hereto. Nothing in
this Agreement, express or implied, is intended to confer upon any party other
than the parties hereto or their respective successors and assigns any rights,
remedies, obligations, or liabilities under or by reason of this Agreement,
except as expressly provided in this Agreement. Notwithstanding anything to the
contrary contained herein, the covenants set forth in Section 6 shall not be
binding upon any entity (other than an affiliate of the Investor) which
acquires any shares of the Stock or a Stock Distribution in a transaction
permitted hereunder.

         7.4 Entire Agreement. This Agreement constitutes the entire
understanding and agreement between the parties with regard to the subject
matter hereof.

         7.5 Notices. Except as otherwise provided, all notices and other
communications required or permitted hereunder shall be in writing, shall be
effective when given, and shall in any event be deemed to be given upon receipt
or, if earlier, (i) five (5) days after deposit with the U.S. postal service or
other applicable postal service, if delivered by first class mail, postage
prepaid, (ii) upon delivery, if delivered by hand, (iii) one (1) business day
after the day of deposit with Federal Express or similar overnight courier,
freight prepaid, if delivered by overnight courier or (iv) one (1) business day
after the day of facsimile transmission, if delivered by facsimile transmission
with copy by first class mail, postage prepaid, and shall be addressed, (a) if
to the Investor, at the Investor's address set forth below its signature, or at
such other address as the Investor shall have furnished to the Company in
writing, or (b) if to the Company, at its address as set forth below its
signature, or at such other address as the Company shall have furnished to the
Investor in writing.

                                       7
<PAGE>   8

         7.6 Amendments and Waivers. Any term of this Agreement may be amended
and the observance of any term of the Agreement may be waived (either generally
or in a particular instance and either retroactively or prospectively) only
with the written consent of the Company and the Investor.

         7.7 Legal Fees. In the event of any action at law, suit in equity or
arbitration proceeding in relation to this Agreement or the Stock or any Stock
Distribution, the prevailing party shall be paid by the other party a
reasonable sum for the attorneys' fees and expenses incurred by such prevailing
party.

         7.8 Expenses. Irrespective of whether the Closing is effected, the
Company and the Investor shall each pay their own costs and expenses incurred
with respect to the negotiation, execution, delivery and performance of this
Agreement.

         7.9 Titles and Subtitles. The titles of the paragraphs and
subparagraphs of this Agreement are for convenience of reference only and are
not to be considered in construing this Agreement.

         7.10 Counterparts. This Agreement may be executed in counterparts,
each of which shall be an original, but all of which together shall constitute
one instrument.

         7.11 Severability. If one or more provisions of this Agreement are
held to be unenforceable under applicable law, such provision shall be excluded
from this Agreement and the balance of the Agreement shall be interpreted as if
such provision were so excluded and shall be enforceable in accordance with its
terms.

         7.12 Confidentiality. The parties hereto agree that, except with the
prior written permission of the other party, it shall at all times keep
confidential and not divulge, furnish, or make accessible to anyone any
confidential information, knowledge, or data concerning or relating to the
business or financial affairs of such other party to which said party has been
or shall become privy by reason of this Agreement, discussions or negotiations
relating to this Agreement, or the performance of its obligations hereunder.

         7.13 Publicity. Except as required by law, no press release, public
statement, advertisement or similar publicity from any party hereunder with
respect to the participation of the Investor or any affiliate thereof in the
transactions contemplated hereby (or any other matter relating to the Company
and such Investor or its affiliates) shall be issued or made without the prior
consent of the Investor. In the event that such publicity or disclosure is
required by law, the Company shall provide the Investor with prior written
notice of such publicity or disclosure. Notwithstanding the foregoing, the
Company may disclose the Investor's participation as a shareholder of the
Company and the number of shares of common stock the Investor owns pursuant to
the terms hereof.

                                       8
<PAGE>   9

         IN WITNESS WHEREOF, the parties hereto have executed this Agreement as
of the day and year herein above first written.

                                         HIGH SPEED ACCESS CORP.
                                         4100 East Mississippi Avenue
                                         Denver, CO 80246
                                         Attn: Dan O'Brien, President

                                              /s/ Daniel J. O'Brien
                                         --------------------------------
                                         By:      Daniel J. O'Brien, CEO

                                         LUCENT TECHNOLOGIES INC.
                                         600 Mountain Avenue
                                         Murray Hill, NJ 07974

                                              /s/ Bill Viqueira
                                         --------------------------------------
                                         By:      Bill Viqueira
                                                  Vice President and Treasurer

                                       9
<PAGE>   10

                                   EXHIBIT A

1.       Registration Rights. The Company covenants and agrees as follows:

         1.1 Definitions. For purposes of this Exhibit A, capitalized terms
used herein and not otherwise defined shall have the meanings ascribed to them
in the Stock Purchase Agreement between the Company and the Investor to which
this Exhibit A is attached. In addition, the following terms used herein shall
have the following meanings:

         (a) The term "Form S-1" means such form under the Act as in effect on
         the date hereof or any registration form under the Act subsequently
         adopted by the SEC which permits inclusion or incorporation of
         substantial information by reference to other documents filed by the
         Company with the SEC.

         (b) The term "Form S-3" means such form under the Act as in effect on
         the date hereof or any registration form under the Act subsequently
         adopted by the SEC which permits inclusion or incorporation of
         substantial information by reference to other documents filed by the
         Company with the SEC.

         (c) The term "1934 Act" means the Securities Exchange Act of 1934, as
         amended.

         (d) The term "register", "registered," and "registration" refer to a
         registration effected by preparing and filing a registration statement
         or similar document in compliance with the Act, and the declaration or
         ordering of effectiveness of such registration statement or document.

         1.2 Request for Registration. If the Company shall receive, at any
time after June 3, 2000, a written request from the Investor that the Company
effect a registration on a Form S-3 and any related qualification or compliance
with respect to the Stock, then the Company shall, as expeditiously as
reasonably possible, effect the registration of all, but not less than all,
such Stock on Form S-3 and all such qualifications and compliances as may be so
requested and as would permit or facilitate the sale and distribution of all of
the Stock. The Company shall have no obligation to effect any registration of
less than all of the Stock.

         (a) Notwithstanding anything to the contrary in this Section 1.2, the
         Company shall not be obligated to effect any such registration,
         qualification or compliance, pursuant to this Section 1.2: (i) if the
         Company shall furnish to the Investor a certificate signed by the
         President of the Company stating that, in the good faith judgment of
         the Board of Directors of the Company, such registration should be
         deferred due to material events directly relating to the Company, in
         which event the Company shall have the right to defer the filing of
         the Form S-3 for a period of not more than 90 days after receipt of
         the request of the Investor under this Section 1.2 (provided, however,
         that the Company may defer such registration only once); or (ii) in
         any particular jurisdiction in which the Company would be required to
         qualify to do business or to execute a general consent to service of
         process in effecting such registration, qualification or compliance.

                                       1
<PAGE>   11

         (b) If Form S-3 is not available to the Company to effect the
         registration of the Stock as contemplated by this Section 1.2, then
         (i) the Company shall effect such registration on Form S-1 and (ii) in
         such event, all references in this Section 1 to Form S-3 shall be read
         as references to Form S-1.

         (c) The Company shall not be obligated to effect, or to take any
         action to effect, any registration pursuant to this Section 1.2 after
         the earlier to occur of the following events: (i) the Company has
         effected one registration pursuant to this Section 1.2, and such
         registration has been declared or ordered effective and otherwise
         satisfies and continues to satisfy the terms and conditions of this
         Section 1.2; or (ii) the Company has voluntarily effected the
         registration of all of the Stock without having first received a
         request for such registration pursuant to this Section 1.2 (a
         "Voluntary Registration"), and such Voluntary Registration has been
         declared or ordered effective and otherwise satisfies and continues to
         satisfy the terms and conditions of this Section 1.2.

         1.3 Obligations of the Company. Whenever required under Section 1.2 to
effect the registration on Form S-3 of the Stock, the Company shall, as
expeditiously as reasonably possible:

         (a) Prepare and file with the SEC a Form S-3 with respect to such
         Stock and use its best efforts to cause such registration statement to
         become effective as soon as reasonably practicable after the mailing
         of the request for such registration but in no event later than ninety
         (90) days after such mailing. The Company shall keep such registration
         statement effective until the earlier of (i) two (2) years after the
         Closing, (ii) the distribution of all of the Stock as contemplated in
         the registration statement has been completed, and (iii) the date
         which all shares of the Stock held by the Investor may immediately be
         sold under Rule 144 during any 90-day period.

         (b) Prepare and file with the SEC such amendments and supplements to
         such registration statement and the prospectus used in connection with
         such registration statement as may be necessary to comply with the
         provisions of the Act with respect to the disposition of all
         securities covered by such registration statement.

         (c) Furnish to the Investor such numbers of copies of a prospectus,
         including a preliminary prospectus, in conformity with the
         requirements of the Act, and such other documents as the Investor may
         reasonably request in order to facilitate the disposition of the
         Stock.

         (d) Use its best efforts to register and qualify the securities
         covered by such registration statement under such other securities or
         Blue Sky laws of such jurisdictions as shall be reasonably requested
         by the Investor; provided that the Company shall not be required in
         connection therewith or as a condition thereto to qualify to do
         business or to file a general consent to service of process in any
         such states or jurisdictions.

                                       2
<PAGE>   12

         (e) Notify the Investor covered by such registration statement at any
         time when a prospectus relating thereto is required to be delivered
         under the Act of the happening of any event as a result of which the
         prospectus included in such registration statement, as then in effect,
         includes an untrue statement of a material fact or omits to state a
         material fact required to be stated therein or necessary to make the
         statements therein not misleading in the light of the circumstances
         then existing.

         (f) Cause all such Stock registered pursuant hereunder to be listed on
         each securities exchange on which similar securities issued by the
         Company are then listed.

         (g) Provide a transfer agent and registrar for all of the Stock
         registered pursuant hereunder and a CUSIP number for all such Stock,
         in each case not later than the effective date of such registration.

         1.4 Investor Obligation to Furnish Information. It shall be a
condition precedent to the obligations of the Company to take any action
pursuant hereto with respect to the Stock that the Investor shall furnish to
the Company such information regarding itself, the Stock, and the intended
method of disposition of such securities as shall be required to effect the
registration of such Stock.

         1.5 Expenses of Registration. All expenses incurred in connection with
registrations, filings or qualifications pursuant hereto, including (without
limitation) all registration, filing and qualification fees, printers' and
accounting fees, fees and disbursements of counsel for the Company (including
fees and disbursements of counsel for the Company in its capacity as counsel to
the Investor hereunder but excluding the fees and disbursements of any other
counsel for the Investor) shall be borne by the Company; provided, however,
that the Company shall not be required to pay for any expenses of any
registration proceeding begun pursuant hereto if the registration request is
subsequently withdrawn at the request of the Investor, unless the Investor
agrees to forfeit its right to any demand registration pursuant hereto;
provided further, however, that if at the time of such withdrawal, the Investor
has learned of a material adverse change in the condition, business, or
prospects of the Company from that known to the Investor at the time of its
request and has withdrawn the request with reasonable promptness following
disclosure by the Company of such material adverse change, then the Investor
shall not be required to pay any of such expenses and shall retain its right of
registration pursuant to Section 1.2.

         1.6 Indemnification. In the event any Stock is included in a
registration statement under Section 1.2:

         (a) To the extent permitted by law, the Company will indemnify and
         hold harmless the Investor, any underwriter (as defined in the Act)
         for the Investor and each person, if any, who controls the Investor or
         underwriter within the meaning of the Act or the 1934 Act, against any
         losses, claims, damages, or liabilities (joint or several) to which
         they may become subject under the Act, the 1934 Act or other federal
         or state law, insofar as such losses, claims, damages, or liabilities
         (or actions in respect thereof) arise out of or are based upon any of
         the following statements, omissions or violations (collectively a
         "Violation"):

                                       3
<PAGE>   13

                  (i) any untrue statement or alleged untrue statement of a
                  material fact contained in such registration statement,
                  including any preliminary prospectus or final prospectus
                  contained therein or any amendments or supplements thereto,

                  (ii) the omission or alleged omission to state therein a
                  material fact required to be stated therein, or necessary to
                  make the statements therein not misleading, or

                  (iii) any violation or alleged violation by the Company of
                  the Act, the 1934 Act, any state securities law or any rule
                  or regulation promulgated under the Act, the 1934 Act or any
                  state securities law; and the Company will pay to the
                  Investor, or such underwriter or controlling person, as
                  incurred, any legal or other expenses reasonably incurred by
                  them in connection with investigating or defending any such
                  loss, claim, damage, liability, or action; provided, however,
                  that the indemnity agreement contained in this subsection (a)
                  shall not apply to amounts paid in settlement of any such
                  loss, claim, damage, liability, or action if such settlement
                  is effected without the consent of the Company (which consent
                  shall not be unreasonably withheld), nor shall the Company be
                  liable in any such case for any such loss, claim, damage,
                  liability, or action to the extent that it arises out of or
                  is based upon a Violation which occurs in reliance upon and
                  in conformity with written information furnished expressly
                  for use in connection with such registration by any such
                  Investor, underwriter or controlling person.

         (b) To the extent permitted by law, the Investor will indemnify and
         hold harmless the Company, each of its directors, each of its officers
         who has signed the registration statement, each person, if any, who
         controls the Company within the meaning of the Act, any underwriter,
         and any controlling person of any such underwriter, against any
         losses, claims, damages, or liabilities (joint or several) to which
         any of the foregoing persons may become subject, under the Act, the
         1934 Act or other federal or state law, insofar as such losses,
         claims, damages, or liabilities (or actions in respect thereto) arise
         out of or are based upon any Violation, in each case to the extent
         (and only to the extent) that such Violation occurs in reliance upon
         and in conformity with written information furnished by such Investor
         expressly for use in connection with such registration; and each such
         Investor will pay, as incurred, any legal or other expenses reasonably
         incurred by any person intended to be indemnified pursuant to this
         subsection (b), in connection with investigating or defending any such
         loss, claim, damage, liability, or action; provided, however, that the
         indemnity agreement contained in this subsection (b) shall not apply
         to amounts paid in settlement of any such loss, claim, damage,
         liability or action if such settlement is effected without the consent
         of the Investor, which consent shall not be unreasonably withheld;
         provided, that, in no event shall any indemnity under this subsection
         (b) exceed the gross proceeds from the offering received by the
         Investor.

         (c) Promptly after receipt by an indemnified party under this Section
         1.6 of notice of the commencement of any action (including any
         governmental action), such indemnified party will, if a claim in
         respect thereof is to be made against any indemnifying party under
         this Section 1.6, deliver to the indemnifying party a written notice
         of the

                                       4

<PAGE>   14

         commencement thereof and the indemnifying party shall have the right
         to participate in, and, to the extent the indemnifying party so
         desires, jointly with any other indemnifying party similarly noticed,
         to assume the defense thereof with counsel mutually satisfactory to
         the parties; provided, however, that an indemnified party (together
         with all other indemnified parties which may be represented without
         conflict by one counsel) shall have the right to retain one separate
         counsel, with the fees and expenses to be paid by the indemnifying
         party, if representation of such indemnified party by the counsel
         retained by the indemnifying party would be inappropriate due to
         actual or potential differing interests between such indemnified party
         and any other party represented by such counsel in such proceeding.
         The failure to deliver written notice to the indemnifying party within
         a reasonable time of the commencement of any such action, if
         prejudicial to its ability to defend such action, shall relieve such
         indemnifying party of any liability to the indemnified party under
         this Section 1.6, but the omission so to deliver written notice to the
         indemnifying party will not relieve it of any liability that it may
         have to any indemnified party otherwise than under this Section 1.6.

         (d) If the indemnification provided for in this Section 1.6 is held by
         a court of competent jurisdiction to be unavailable to an indemnified
         party with respect to any loss, liability, claim, damage, or expense
         referred to therein, then the indemnifying party, in lieu of
         indemnifying such indemnified party hereunder, shall contribute to the
         amount paid or payable by such indemnified party as a result of such
         loss, liability, claim, damage, or expense in such proportion as is
         appropriate to reflect the relative fault of the indemnifying party on
         the one hand and of the indemnified party on the other in connection
         with the statements or omissions that resulted in such loss,
         liability, claim, damage, or expense as well as any other relevant
         equitable considerations. The relative fault of the indemnifying party
         and of the indemnified party shall be determined by reference to,
         among other things, whether the untrue or alleged untrue statement of
         a material fact or the omission to state a material fact relates to
         information supplied by the indemnifying party or by the indemnified
         party and the parties' relative intent, knowledge, access to
         information, and opportunity to correct or prevent such statement or
         omission.

         (e) Notwithstanding the foregoing, to the extent that the provisions
         on indemnification and contribution contained in an underwriting
         agreement entered into in connection with the underwritten public
         offering are in conflict with the foregoing provisions, the provisions
         in the underwriting agreement shall control.

         (f) The obligations of the Company and the Investor under this Section
         1.6 shall survive the completion of any offering of the Stock in a
         registration statement pursuant hereto, and otherwise.

         1.7 Termination. The Company's obligation to register the Stock
pursuant to this agreement shall terminate on the earlier of (i) the second
anniversary of the Closing and (ii) the date on which all shares of the Stock
held by the Investor may immediately be sold under Rule 144 during any 90-day
period.

                                       5

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