Document:

Investor Rights Agreement

 Exhibit 4.4 
  

INVESTOR RIGHTS AGREEMENT 
  
 THIS INVESTOR RIGHTS AGREEMENT (the “Agreement”) is entered into as of January 5, 2004, by and among REDBACK NETWORKS, INC., a Delaware
corporation (the “Company”), and the persons set forth on the Schedule of Investors attached hereto as Exhibit A (the “Investors”). 
  
 RECITALS 
  
 1. The Company has entered into a Securities Purchase Agreement, dated as of the date hereof (the “Purchase Agreement”), with each of the
Investors identified therein pursuant to which the Company has sold to the Investors, and the Investors have purchased from the Company, shares of the Company’s Series B Convertible Preferred Stock, par value $0.0001 per share (the
“Series B Preferred Stock”) and warrants to purchase shares of the Company’s Common Stock, par value $0.0001 per share (the “Common Stock”). 
  
 2. The Investors may purchase up to 3,000,000 additional shares of Common Stock or warrants to purchase Common Stock in
market transactions, privately negotiated transactions or otherwise, as contemplated by Section 2.25 of the Purchase Agreement (collectively, “Market Securities”). 
  
 3. As a condition to each of the Investors’ obligations under the Purchase Agreement, the Company and the Investors
will enter into this Agreement for the purpose of granting certain registration and other rights to the Investors. 
  
 NOW, THEREFORE, in consideration of the covenants and promises set forth herein, and for other good and valuable consideration, intending to be legally
bound hereby the parties agree as follows: 
  
 SECTION 1
Certain Definitions. As used in this Agreement, the capitalized terms identified in the Preamble and the Recitals shall have the meanings identified therein and the following terms shall have the following respective meanings: 
  
 “Commission” shall mean the Securities and Exchange
Commission or any other federal agency at the time administering the Securities Act. 
  
 “Exchange Act” shall mean the Securities Exchange Act of 1934, as amended, or any similar successor federal statute, and the rules and regulations of the Commission thereunder, all as the same shall
be in effect from time to time. 
  
 “Holder”
shall mean (i) any Investor holding Registrable Securities and (ii) any person holding Registrable Securities to whom the rights under this Agreement have been transferred in accordance with Section 13 hereof. 
  

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 The term “person” means an individual, corporation, partnership, limited liability
company, joint venture, association, trust, unincorporated organization, other legal entity, or any government or governmental agency or authority. 
  
 The terms “register”, “registered” and “registration” refer to a registration effected by preparing and
filing a registration statement in compliance with the Securities Act, and the declaration or ordering of the effectiveness of such registration statement. 
  
 “Registration Expenses” shall mean all expenses incurred by the Company in complying with Sections 5 and 6 hereof, including, without
limitation, all registration, qualification, listing and filing fees, printing expenses, escrow fees, fees and disbursements of counsel for the Company, blue sky fees and expenses, and the expense of any special audits incident to or required by any
such registration, provided that Registration Expenses shall not be deemed to include any Selling Expenses. 
  
 “Registrable Securities” shall mean the (i) the Warrants and Market Securities, (ii) any shares of Common Stock issued or issuable upon
conversion of the shares of Series B Preferred Stock (including Series B Preferred Stock or Common Stock paid as a dividend on Series B Preferred Stock) or issued or issuable upon exercise of the Warrants or Market Securities, or (iii) any
securities issued or issuable in respect of the securities describe in clauses (i) and (ii) above upon any stock split, stock dividend, recapitalization or similar event; provided, however, that the Warrants, Market Securities, shares of
Common Stock or other securities shall only be treated as Registrable Securities if and so long as they have not been (A) sold to or through a broker or dealer or underwriter pursuant to an effective registration statement or in compliance with Rule
144 under the Securities Act or (B) transferred in a transaction pursuant to which the registration rights are not also assigned in accordance with Section 13 hereof. 
  
 “Restricted Securities” shall mean the Shares and Warrants required to bear the legend set forth in Section
3 hereof. 
  
 “Securities Act” shall mean the
Securities Act of 1933, as amended, and the rules and regulations promulgated thereunder or any similar federal statute and the rules and regulations of the Commission thereunder, all as the same shall be in effect at the time. 
  
 “Selling Expenses” shall mean all underwriting discounts,
selling commissions and stock transfer taxes applicable to the securities registered by the Holders. 
  
 “Shares” shall mean all shares of Series B Preferred Stock purchased by the Investors pursuant to the Purchase Agreement, all shares of
Series B Preferred Stock issued to the Investors as dividends, all shares of Common Stock issued or issuable in respect thereof and all shares of Common Stock issued or issuable upon exercise of the Warrants or Market Securities. 
  
 “Warrants” means the Warrants issued under the Purchase
Agreement. 
  

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 SECTION 2 Restrictions. The Shares and Warrants shall not be sold, assigned, transferred or
pledged except upon the conditions specified in Section 4, which conditions are intended to ensure compliance with the provisions of the Securities Act. 
  
 SECTION 3 Restrictive Legend. Each certificate representing the Shares and each Warrant (unless otherwise permitted by the provisions of Section 4
below) shall be stamped or otherwise imprinted with a legend in the following form (in addition to any legend required under applicable state securities laws): 
  
 “THE SECURITIES REPRESENTED BY THIS CERTIFICATE OR WARRANT HAVE BEEN ACQUIRED FOR INVESTMENT AND HAVE NOT BEEN
REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED. SUCH SECURITIES MAY NOT BE SOLD, TRANSFERRED OR PLEDGED IN THE ABSENCE OF SUCH REGISTRATION OR AN EXEMPTION FROM SUCH REGISTRATION.” 
  
 Each Investor consents to the Company making a notation on its records and
giving instructions to any transfer agent of the Restricted Securities in order to implement the restrictions on transfer set forth in Section 4. 
  
 SECTION 4 Notice of Proposed Transfers. Each Investor agrees to comply in all respects with the provisions of this Section 4. Prior to any proposed
sale, assignment, transfer or pledge of any Restricted Securities, unless there is in effect a registration statement under the Securities Act covering the proposed transfer, an Investor shall give written notice to the Company of such
Investor’s intention to effect such transfer, sale, assignment or pledge. Each such notice shall describe the manner and circumstances of the proposed transfer, sale, assignment or pledge in sufficient detail, and shall be accompanied by either
(i) an opinion of legal counsel reasonably satisfactory to the Company to the effect that the proposed transfer of the Restricted Securities may be effected without registration under the Securities Act, (ii) a “no action” letter from the
Commission to the effect that the transfer of such securities without registration will not result in a recommendation by the staff of the Commission that action be taken with respect thereto or (iii) any other evidence reasonably satisfactory to
counsel to the Company, whereupon such Investor shall be entitled to transfer such Restricted Securities in accordance with the terms of the notice delivered by such Investor to the Company. Notwithstanding the foregoing, the Company will not
require such a notice or legal opinion or “no action” letter (a) in any customary transaction in compliance with Rule 144, (b) in any transaction in which a holder that is a corporation distributes Restricted Securities solely to its
majority owned subsidiaries or affiliates for no consideration or (c) in any transaction in which a holder that is a partnership or limited liability company distributes Restricted Securities solely to its affiliates (including affiliated fund
partnerships), partners or members thereof for no consideration. Each certificate or warrant evidencing the Restricted Securities transferred as above provided shall bear the appropriate restrictive legend set forth in Section 3 above, except that
such certificate or warrant shall not bear such restrictive legend if such legend is not required in order to establish compliance with any provisions of the Securities Act. Upon the request of a holder of a certificate or warrant bearing such
restrictive legend, the Company shall remove such restrictive legend from such certificate or warrant if such legend is not required in order to establish compliance with any provisions of the Securities Act. 
  

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 SECTION 5 Mandatory Registration. The Company shall file a registration statement covering the
sale or distribution by the Holders, on a delayed or continuous basis, including without limitation, by way of underwritten offering, block sale or other distribution plan designated by the Holders of a majority of the Registrable Securities from
time to time, of all of the Registrable Securities on Form S-3 (except if the Company is not then eligible to register for resale the Registrable Securities on Form S-3, in which case such registration shall be on another appropriate form in
accordance herewith) (the “Shelf Registration”) within 90 days after the date hereof and shall cause the Shelf Registration to be declared effective by the Commission (and shall take such appropriate actions as are related thereto
including, without limitation, the execution of an undertaking to file post-effective amendments, appropriate qualification, if necessary, under applicable blue sky or other state securities laws and appropriate compliance with applicable
regulations issued under the Securities Act and any other governmental requirements or regulations) as promptly as possible after the filing thereof, but in any event prior to the date that is 165 days after the date hereof. Once declared effective,
the Company shall use its reasonable best efforts to cause (x) the Shelf Registration to be effective until the earlier of (i) five (5) years from the date hereof and (ii) such time as the Holders own shares of Common Stock, or shares of Common
Stock issuable upon exercise or conversion of the Registrable Securities, which in the aggregate are less than 5% of the Company’s outstanding shares of Common Stock and the Holders may sell all of their Registrable Securities without
registration pursuant to Rule 144 under the Securities Act in any and all three-month periods, and (y) subject to Section 9(j), the Shelf Registration to be useable by the Holders during such entire period. The Company shall not be obligated to take
any action to effect the Shelf Registration in any particular jurisdiction in which the Company would be required to qualify to do business, subject itself to general taxation or execute a general consent to service of process in effecting such
registration, qualification or compliance unless the Company is already qualified to do business, subject to general taxation or subject to service, as the case may be, in such jurisdiction, except as may be required by the Securities Act.

  
 SECTION 6 Company Registration. 
  
 (a) Notice of Registration. If at any time or from time to time, the
Company shall determine to file a registration statement for an underwritten public offering of its equity securities, the Company will: 
  
 (i) promptly give to each Holder written notice thereof; and 
  
 (ii) subject to Section 6(b) below, include in such registration (and any related qualification under blue sky laws or other compliance) all the
Registrable Securities specified in a written request or requests made within 15 days after receipt of such written notice from the Company by any Holder. 
  
 (b) Underwriting. The right of any Holder to registration pursuant to this Section 6 shall be conditioned upon such Holder’s participation in
such underwriting and the 
  

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 inclusion of Registrable Securities in the underwriting to the extent provided herein. Each Holder proposing to
distribute its securities through such underwriting shall (together with the Company and the other holders distributing their securities through such underwriting) enter into and perform such Holder’s obligations under an underwriting agreement
in customary form with the managing underwriter selected for such underwriting by the Company. Notwithstanding any other provision of this Section 6, if the managing underwriter provides written notice to the Holders that it has determined that
market factors require a limitation on the number of shares to be included in such registration, the managing underwriter shall include in the offering the maximum number of shares that may be included in the offering consistently with such market
factors and shall allocate such included shares as follows: (i) first, the shares requested to be sold by the Company for its own account or the holder of securities initiating the registration under demand registration rights granted by the
Company; (ii) second, among the Holders and other holders pro rata based upon the number of Registrable Securities owned by such Holders, the shares requested to be included in the offering by the Holders and the shares requested to be
included in the offering pursuant to piggyback registration rights by other holders granted by the Company; and (iii) third, any other shares requested or proposed by the Company to be included for resale. To facilitate the allocation of shares in
accordance with the above provisions, the Company or the underwriters may round the number of shares allocated to any Holder or other holder to the nearest 100 shares. If any Holder or other holder disapproves of the terms of any such underwriting,
such holder may elect to withdraw therefrom by written notice to the Company and the managing underwriter. Any securities excluded or withdrawn from such underwriting shall be withdrawn from such registration. 
  
 (c) Right to Terminate Registration. The Company shall have the right
to terminate or withdraw any registration initiated by it under this Section 6 prior to the effectiveness of such registration, whether or not any Holder has elected to include securities in such registration. 
  

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 SECTION 7 Limitations on Subsequent Registration Rights. From and after the date hereof, the
Company shall not enter into any agreement granting any holder or prospective holder of any securities of the Company registration rights with respect to such securities that are inconsistent with the rights granted to the Holders herein, without
the consent of Holders of at least a majority of the Registrable Securities. 
  
 SECTION 8 Expenses of Registration. All Registration Expenses incurred in connection with any registration pursuant to Sections 5 and 6 and the reasonable cost of one special legal counsel to represent all of
the Holders together in any such registration shall be borne by the Company. All Selling Expenses relating to securities registered on behalf of the Holders shall be borne by the Holders of the registered securities included in such registration
pro rata on the basis of the number of shares so registered. 
  
 SECTION 9 Registration Procedures. In the case of each registration effected by the Company pursuant to Sections 5 and 6, the Company will keep each Holder participating in such registration advised in writing as to the initiation of
each registration and as to the completion thereof and, at its expense, the Company will: 
  
 (a) prepare and file with the Commission a registration statement with respect to such securities; 
  
 (b) prepare and file with the Commission such amendments, including post-effective amendments, and supplements to such registration statement and the
prospectus used in connection with such registration statements 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 and as may be necessary
to keep the registration statement continuously effective for the period set forth in this Agreement; 
  
 (c) furnish to the Holders participating in such registration and to their legal counsel copies of the registration statement proposed to be filed, and
provide such Holders and their legal counsel the reasonable opportunity to review and comment on such registration statement; 
  
 (d) furnish to the Holders participating in such registration and to the underwriters of the securities being registered such reasonable number of copies
of the registration statement, preliminary prospectus, final prospectus and such other documents as such underwriters may reasonably request in order to facilitate the public offering of such securities; 
  
 (e) notify each Holder of Registrable Securities covered by such registration
statement at any time when a prospectus relating thereto is required to be delivered under the Securities 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 or incomplete in the light of the circumstances then existing, and, subject to Section
9(j), at the request of any such Holder, prepare promptly and furnish to such Holder a reasonable number of copies of a supplement to or an amendment of such prospectus as may be 
  

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 necessary so that, as thereafter delivered to the purchaser of such shares, such prospectus shall not include an untrue
statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein not misleading or incomplete in the light of the circumstances then existing; 
  
 (f) use reasonable 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 Holders, 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; 
  
 (g) make available for inspection by any Holder participating in such registration, any underwriter participating in any disposition pursuant to such
registration, and any attorney or accountant retained by any such Holder or underwriter, all relevant financial and other records, pertinent corporate documents and properties of the Company, and cause the Company’s officers and directors to
supply all information reasonably requested by any such Holder, underwriter, attorney or accountant in connection with such registration statement; provided, however, that such Holder, underwriter, attorney or accountant shall agree to hold
in confidence and trust all information so provided; 
  
 (h) in
the event that the Registrable Securities are being offered in an underwritten public offering, enter into and perform its obligations under an underwriting agreement, in usual and customary form, including, without limitation, customary
indemnification and contribution obligations, with the underwriters of such offering, and shall participate and cooperate with the underwriters in connection with any road show or marketing activities customary for an underwritten public offering;

  
 (i) use reasonable best efforts to furnish, on the date that
such Registrable Securities are delivered to the underwriters for sale, if such securities are being sold through underwriters, (i) an opinion, dated as of such date, of the legal counsel representing the Company for the purposes of such
registration, in form and substance as is customarily given to underwriters in an underwritten public offering, addressed to the underwriters, if any, and (ii) a letter dated as of such date, from the independent certified public accountants of the
Company, in form and substance as is customarily given by independent certified public accountants to underwriters in an underwritten public offering, addressed to the underwriters; and 
  
 (j) notwithstanding any other provision of this Agreement, if the Board of Directors of the Company has determined in good
faith that the continued use of the prospectus and registration statement by the Holders would be materially detrimental to the Company, the Company shall have the right to suspend the use of the prospectus and the registration statement covering
any Registrable Security for such period of time as its use would be materially detrimental to the Company by delivering written notice of such suspension to all Holders listed on the Company’s records; provided, however, that the
Company may exercise the right to such suspension only once in any 12-month period and for a period not to exceed 90 days. From and after the date of a notice of suspension under this Section 9(j), each Holder agrees not to use the 
  

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 prospectus or registration statement until the earlier of (1) notice from the Company that such suspension has been
lifted or (2) the 90th day following the giving of such notice. 
  
 SECTION 10 Indemnification. 
  
 (a) The Company will indemnify each Holder, each Holder’s current and
former officers, directors, partners and members, and each person controlling such Holder within the meaning of Section 15 of the Securities Act, with respect to which registration, qualification or compliance has been effected pursuant to this
Agreement, and each underwriter, if any, and each person who controls any underwriter within the meaning of Section 15 of the Securities Act, against all expenses, claims, losses, damages or liabilities, joint or several, (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 registration statement, prospectus, preliminary prospectus, offering circular or other document, or any amendment or
supplement thereto, 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, in light
of the circumstances in which they were made, not misleading, or any violation by the Company of any rule or regulation promulgated under the Securities Act, Exchange Act or state securities laws applicable to the Company in connection with any such
registration, qualification or compliance, and the Company will reimburse each such Holder, each such Holder’s current and former officers, directors, partners and members, and each person controlling such Holder, each such underwriter and each
person who controls any such underwriter, for any legal and any other expenses reasonably incurred in connection with investigating, preparing or defending any such claim, loss, damage, liability or action, as such expenses are incurred. The
indemnity agreement contained in this section shall not apply to amounts paid in settlement of any loss, claim, damage, liability or action if such settlement is effected without the consent of the Company (which consent shall not be unreasonably
withheld or delayed), nor shall the Company be liable to a Holder in any such case for any such loss, claim, damage, liability or action (1) to the extent that it arises out of or is based upon a violation or alleged violation of any state or
federal law (including any claim arising out of or based on any untrue statement or alleged untrue statement or omission or alleged omission in the registration statement or prospectus) which occurs in reliance upon and in conformity with written
information furnished expressly for use in connection with such registration by or on behalf of such Holder or (2) in the case of a sale directly by a Holder of Registrable Securities (including a sale of such Registrable Securities through any
underwriter retained by such Holder engaging in a distribution solely on behalf of such Holder), such untrue statement or alleged untrue statement or omission or alleged omission was contained in a preliminary prospectus and corrected in a final or
amended prospectus, and such Holder failed to deliver a copy of the final or amended prospectus at or prior to the confirmation of the sale of the Registrable Securities to the person asserting any such loss, claim, damage or liability in any case
in which such delivery is required by the Securities Act. 
  
 (b)
Each Holder will, if Registrable Securities held by such Holder are included in the securities as to which such registration, qualification or compliance is being effected, indemnify, severally and not jointly, the Company, each of its directors,
officers, partners and members, each underwriter, if any, of the Company’s securities covered by such a registration statement, each person who controls the Company or such underwriter within the 
  

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 meaning of Section 15 of the Securities Act, and each other such Holder, each of its officers, directors, partners and
members and each person controlling such Holder within the meaning of Section 15 of the Securities Act, 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, preliminary 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, such Holders, such directors, officers, partners, members, persons, underwriters or control persons for any legal or any other expenses reasonably
incurred in connection with investigating or defending any such claim, loss, damage, liability or action, as such expenses are incurred, 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 such Holder and stated to be specifically
for use therein, provided that in no event shall any indemnity under this subparagraph 10(b) payable by a Holder exceed the amount by which the net proceeds actually received by such Holder from the sale of Registrable Securities included in
such registration exceeds the amount of any other losses, expenses, settlements, damages, claims and liabilities that such Holder has been required to pay by reason of such untrue or alleged untrue statement or omission or alleged omission. The
indemnity agreement contained in this section shall not apply to amounts paid in settlement of any loss, claim, damage, liability or action if such settlement is effected without the consent of the applicable Holder (which consent shall not be
unreasonably withheld or delayed), nor shall the Holder be liable for any such loss, claim, damage, liability or action where such untrue statement or alleged untrue statement or omission or alleged omission was contained in a preliminary prospectus
and corrected in a final or amended prospectus, and the Company or the underwriters failed to deliver a copy of the final or amended prospectus at or prior to the confirmation of the sale of the Registrable Securities to the person asserting any
such loss, claim, damage or liability in any case in which such delivery is required by the Securities Act 
  
 (c) Each party entitled to indemnification under this Section 10 (the “Indemnified Party”) shall give notice to the party required to
provide indemnification (the “Indemnifying Party”) promptly after such Indemnified Party has actual knowledge of any claim as to which indemnity may be sought, and shall permit the Indemnifying Party to assume the defense of any
such claim or any litigation resulting therefrom, provided that counsel for the Indemnifying Party, who shall conduct the defense of such claim or litigation, shall be approved by the Indemnified Party (whose approval shall not unreasonably
be withheld), and the Indemnified Party may participate in such defense at such party’s expense; 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 conflicting interests between such Indemnified Party and any other party represented by such counsel in such proceeding. The failure of any Indemnified Party to give notice as provided herein shall relieve the Indemnifying
Party of its obligations under this Section 10 only to the extent that the failure to give such notice is materially prejudicial to an Indemnifying Party’s 
  

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 ability to defend such action. No Indemnifying Party, in the defense of any such claim or litigation, shall, except with
the consent of each Indemnified Party (which consent shall not be unreasonably withheld), consent to entry of any judgment or enter into any settlement which does not include as an unconditional term thereof the giving by the claimant or plaintiff
to such Indemnified Party of a release from all liability in respect to such claim or litigation. The indemnity agreements contained in this Section 10 shall not apply to amounts paid in settlement of any loss, claim, damage, liability or action if
such settlement is effected without the consent of the Indemnifying Party, which consent shall not be unreasonably withheld or delayed. 
  
 (d) If the indemnification provided for in this Section 10 is held by a court of competent jurisdiction to be unavailable to an Indemnified Party, other
than pursuant to its terms, with respect to any claim, loss, damage, liability or action referred to therein, then, subject to the limitations contained in Section 10(e), 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 claim, loss, damage, liability or action in such proportion as is appropriate to reflect the relative fault of the Indemnifying Party on the one
hand and the Indemnified Party on the other in connection with the actions that resulted in such claims, loss, damage, liability or action, 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 related 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. The Company and the Holders agree that it would not be just and equitable if contribution
pursuant to this Section 10(d) were based solely upon the number of entities from whom contribution was requested or by any other method of allocation which does not take account of the equitable considerations referred to above in this Section
10(d). In no event shall any Holder’s contribution obligation under this Section 10(d) exceed the amount by which the net proceeds actually received by such Holder from the sale of Registrable Securities included in such registration exceeds
the amount of any other losses, expenses, settlements, damages, claims and liabilities that such Holder has been required to pay by reason of such untrue or alleged untrue statement or omission or alleged omission. 
  
 (e) The amount paid or payable by an Indemnified Party as a result of the
losses, claims, damages and liabilities referred to above in this Section 10 shall be deemed to include any legal or other expenses reasonably incurred by such Indemnified Party in connection with investigating or defending any such action or claim,
subject to the provisions of Section 10 hereof. No person guilty of fraudulent misrepresentation (within the meaning of the Securities Act) shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation.

  

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 SECTION 11 Information by Holder. The Holder or Holders of Registrable Securities included in any
registration shall furnish to the Company such information regarding such Holder or Holders, the Registrable Securities held by them and the distribution proposed by such Holder or Holders as the Company may reasonably request in writing and as
shall be required in connection with any registration, qualification or compliance referred to in this Agreement. 
  
 SECTION 12 Rule 144 Reporting. With a view to making available the benefits of certain rules and regulations of the Commission which may at any
time permit the sale of the Restricted Securities to the public without registration, Company agrees to use its best efforts to: 
  
 (a) make and keep public information available, as those terms are understood and defined in Rule 144 under the Securities Act; 
  
 (b) file with the Commission in a timely manner all reports and other
documents required of the Company under the Securities Act and the Exchange Act; and 
  
 (c) so long as a Holder owns any Restricted Securities, to furnish to the Holder forthwith upon request a written statement by the Company as to its compliance with the reporting requirements of said Rule 144, the
Securities Act and the Exchange Act, a copy of the most recent annual or quarterly report of the Company, and such other reports and documents of the Company and other information in the possession of or reasonably obtainable by the Company as a
Holder may reasonably request in availing itself of any rule or regulation of the Commission allowing a Holder to sell any such securities without registration. 
  

SECTION 13 Transfer of Registration Rights. The rights to cause the Company to register securities granted to a Holder under this Agreement may
be assigned to a transferee or assignee in connection with any transfer or assignment of Registrable Securities by such party; provided, however, that (a) such transfer may otherwise be effected in accordance with applicable securities laws,
(b) prior written notice of such assignment is given to the Company and (c) such transferee or assignee (i) is a subsidiary, affiliated partnership, affiliate or partner or limited liability company member (including limited partners, retired
partners, spouses and ancestors, lineal descendants and siblings of such partners or spouses who acquire Registrable Securities by gift, will or intestate succession) of such Holder or (ii) acquires from such Holder at least 500,000 Registrable
Securities (as adjusted for any stock dividends paid in Registrable Securities, and combinations, stock splits, recapitalization and the like each with respect to shares of Registrable Securities). All shares of Registrable Securities transferred by
affiliated Persons (including current and retired partners, current and former members, current affiliates and current and former stockholders) shall be aggregated together for the purpose of determining the availability of any rights under this
Section 13. 
  
 SECTION 14 Termination of Rights. The
rights of any particular Holder to cause the Company to register securities under Section 6 shall terminate with respect to such Holder upon the earlier of (i) five (5) years from the date hereof or (ii) such time as the Holders own shares of Common
Stock, or shares of Common Stock issuable upon exercise or conversion of the Registrable Securities, which in the aggregate are less than 5% of the Company’s outstanding 
  

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 shares of Common Stock and the Holders may sell all of their Registrable Securities without registration pursuant to Rule
144 under the Securities Act in any and all three-month period. 
  
 SECTION 15 Third Parties. Nothing in this Agreement, express or implied, is intended to confer upon any party, other than the parties hereto, and their respective successors and assigns, any rights, remedies, obligations or
liabilities under or by reason of this Agreement, except as expressly provided herein. 
  
 SECTION 16 Governing Law. This Agreement shall be governed by and construed under the laws of the State of California without regard to choice of laws or conflict of laws provisions thereof. 
  
 SECTION 17 Counterparts. This Agreement may be executed in two or more
counterparts and signature pages may be delivered by facsimile, each of which shall be deemed an original, but all of which together shall constitute one and the same instrument. 
  
 SECTION 18 Notices. All notices and other communications required or permitted hereunder shall be in writing and
shall be (A) mailed by registered or certified mail, postage prepaid, return receipt requested, (B) delivered by a nationally recognized overnight courier, (C) sent by confirmed telecopy or (D) otherwise delivered by hand or by messenger, addressed
(i) if to an Investor, at such Investor’s address set forth on Exhibit A, or at such other address as such Investor shall have furnished to the Company in writing; or (ii) if to the Company, at its address set forth on the signature page of
this Agreement addressed to the attention of the Corporate Secretary, with a copy to Wilson, Sonsini, Goodrich & Rosati, 650 Page Mill Road, Palo Alto, California 94304, facsimile (650) 493-6811, Attention: Page Mailliard, Esq., or to such other
address as the Company shall have furnished to the Investors. If notice is provided by mail, notice shall be deemed to be given two business days after proper deposit in a mailbox; if by overnight courier, notice shall be deemed to be given on the
next business day after deposit; if by facsimile, on the next business day after completion of such facsimile transmission as conclusively evidenced by the transmission receipt; and if by hand or messenger, upon receipt by the addressee. 

 
 SECTION 19 Severability. If one or more provisions of this
Agreement are held to be unenforceable under applicable law, portions of such provisions, or such provisions in their entirety, to the extent necessary, shall be severed from this Agreement, and the balance of this Agreement shall be enforceable in
accordance with its terms. 
  
 SECTION 20 Amendment and
Waiver. Any provision of this Agreement may be amended or waived with the written consent of the Company and the holders of at least a majority of the outstanding Registrable Securities. Any amendment or waiver effected in accordance with this
paragraph shall be binding upon each Holder and the Company. In addition, the Company may waive performance of any obligation owing to it, as to some or all of the Holders, or agree to accept alternatives to such performance, without obtaining the
consent of any holder. In the event that an underwriting agreement is entered into between the Company and any Holder, and such underwriting agreement contains terms differing from this Agreement, as to any such Holder the terms of such underwriting
agreement shall govern. 
  

 12 

 SECTION 21 Rights of Holders. Each party to this Agreement shall have the absolute right to
exercise or refrain from exercising any right or rights that such party may have by reason of this Agreement, including, without limitation, the right to consent to the waiver or modification of any obligation under this Agreement, and such party
shall not incur any liability to any other party or other Holder of any securities of the Company as a result of exercising or refraining from exercising any such right or rights. 
  
 SECTION 22 Delays or Omissions. No delay or omission to exercise any right, power or remedy accruing to any party to
this Agreement, upon any breach or default of any other party, shall impair any such right, power or remedy of such non-breaching party 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 any party of any breach or default under this Agreement, or any waiver on the part of any party 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 any holder, shall be cumulative and not alternative. 
  
 SECTION 23 Titles and Subtitles. The titles and subtitles used in this Agreement are used for convenience only and
are not to be considered in construing or interpreting this Agreement. 
  
 SECTION 24 Legal Fees. If any action at law or in equity (including arbitration) is necessary to enforce or interpret the terms of this Agreement, the prevailing party shall be entitled to reasonable attorneys’ fees, costs and
necessary disbursements, including on appeal, in addition to any other relief to which such party may be entitled. 
  

 13 

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

	
	 THE COMPANY:

	
	REDBACK NETWORKS INC.
		
	By:	 	 /s/ Thomas L. Cronan III

	 Name:
	 	 Thomas L. Cronan III

	 Title:
	 	 Senior Vice President of Finance and
 Administration and Chief Financial
 Officer

		
	 Address:
	 	 300 Holger Way
 San Jose, CA 95134-1362
 Facsimile: (408) 750 5195
 Attention: General Counsel

 THE INVESTORS: 
  
 TCV IV, L.P. 
  
 By: Technology Crossover Management IV, L.L.C. 
 Its:  General Partner 
  
 By: /s/ Robert C.
Bensky                             
 Name: Robert C. Bensky 
 Title:   Attorney in Fact 
  
 TCV IV
STRATEGIC PARTNERS, L.P. 
  
 By: Technology
Crossover Management IV, L.L.C., 
 Its:  General Partner 
  
 By: /s/ Robert C.
Bensky                             
 Name: Robert C. Bensky 
 Title:   Attorney in Fact 

 EXHIBIT A 
  
 SCHEDULE OF INVESTORS 
  
 TCV IV, L.P. 
 TCV IV STRATEGIC PARTNERS, L.P. 
  
 Mailing address for each Investor: 
  
 Technology Crossover Ventures 
 528 Ramona Street 
 Palo Alto, California
94301 
 Attention: Carla S. Newell 
 Phone: (650) 614-8224 
 Fax: (650) 614-8222 
  

with a copy to: 
  
 Technology Crossover Ventures 
 56 Main
Street, Suite 210 
 Millburn, New Jersey 07041 
 Attention: Robert C. Bensky 
 Phone: (973) 467-5320 
 Fax: (973) 467-5323 
  
 and: 
  
 Latham & Watkins LLP 
 135 Commonwealth
Drive 
 Menlo Park, California 94025 
 Attention: Peter Kerman 
 Phone: (650) 328-4600 
 Fax: (650) 463-2600Securities Purchase Agreement

 Exhibit 10.1 
  
 SECURITIES PURCHASE AGREEMENT 
  

THIS SECURITIES PURCHASE AGREEMENT (this “Agreement”) is made as of January 2, 2004, by and among REDBACK NETWORKS, INC. a Delaware
corporation (the “Company”), and the investors listed on Exhibit A hereto, each of which is herein referred to as an “Investor” and all of which are collectively referred to herein as the
“Investors.” Unless otherwise defined herein, capitalized terms used herein shall have the definitions set forth in Section 7.14 hereof. 
  
 RECITALS 
  
 WHEREAS, the Company has filed with the United States Bankruptcy Court for the District of Delaware (the “Court”) a Prepackaged Plan or
Reorganization, as supplemented prior to the date hereof (the “Plan”) in connection with its Chapter 11 Bankruptcy Case, which Plan was confirmed on December 22, 2003 and became effective in accordance with the Plan’s terms and
conditions on the date hereof, prior to the execution of this Agreement. 
  
 WHEREAS, the Company desires to sell and the Investors desire to purchase (i) 651,749 shares of the Company’s Series B Convertible Preferred Stock, par value $0.0001 per share (the “Series B Preferred
Stock”), and (ii) warrants to purchase an aggregate of 1,629,373 shares of the Company’s common stock, par value $0.0001 per share (the “Common Stock”) at an initial exercise price of $5.00 per share in the form
attached hereto as Exhibit B (collectively, the “Warrants”). 
  
 AGREEMENT 
  
 NOW
THEREFORE, in consideration of the mutual covenants and agreements set forth herein and for other good and valuable consideration the receipt and adequacy of which is hereby acknowledged, the parties hereto, intending to be legally bound, hereby
agree as follows: 
  
 1. Purchase and Sale of Shares and the
Warrant. 
  
 1.1. Sale and Issuance of Series B Preferred
Stock. Subject to the terms and conditions of this Agreement, each Investor agrees, severally but not jointly, to purchase at the Closing, and the Company agrees to sell and issue to each Investor at the Closing, that number of shares of the
Company’s Series B Preferred Stock set forth opposite each Investor’s name on Exhibit A hereto at a purchase price of $46.03 per share. The shares of Series B Preferred Stock to be sold pursuant to this Agreement are collectively
referred to herein as the “Shares.” The Series B Preferred Stock shall have the rights, preferences, privileges and restrictions set forth in the form of certificate of designation for the Series B Preferred Stock attached hereto as
Exhibit C (the “Certificate of Designation”), which Certificate of Designation will be filed with the Secretary of State of the State of Delaware prior to the Closing (as defined below). 
  
 1.2. Sale and Issuance of the Warrants. Upon the terms and conditions
of this Agreement, each Investor agrees, severally but not jointly, to purchase at the Closing, and the Company agrees to sell and issue to each Investor at the Closing, a Warrant for that number of shares of Common Stock opposite each
Investor’s name on Exhibit A, at a purchase price of 
  

 1 

 $0.01 for each share of Common Stock subject to the Warrant. The shares of Common Stock issuable upon exercise of the
Warrants are collectively referred to as the “Warrant Shares”. The Company and the Investors, as a result of arm’s length bargaining, agree that (i) neither the Investors nor any of their affiliates have rendered or have agreed
to render any services to the Company in connection with this Agreement or the issuance of the Shares or the Warrants; and (ii) the Warrants are not being issued as compensation. The Company and the Investors agree that the fair market value of the
Warrants purchased by each Investor is equal to $0.01 multiplied by the number of shares of Common Stock for which such Warrant is initially exercisable, and to file all federal, state, local and foreign tax returns in a manner consistent with such
valuation. 
  
 1.3. Closing. The closing of the purchase
and sale of the Shares and Warrants shall take place at the offices of Latham & Watkins LLP, 135 Commonwealth Drive, Menlo Park, California promptly following the satisfaction or waiver of the conditions set forth in Sections 4 and 5 (other than
satisfaction of conditions which will be satisfied at the closing) or at such other time and place as the Company and Investors purchasing a majority of the Shares mutually agree (which time and place are designated as the
“Closing”). At the Closing, (i) the Company shall deliver to each Investor a certificate or certificates representing the Shares and the duly executed Warrants purchased by each Investor against payment of the purchase price
therefor by wire transfer of immediately available funds to an account designated by the Company, and (ii) the Company and the Investors shall make the other deliveries provided for in Sections 4 and 5. 
  
 2. Representations and Warranties of the Company. Except as set forth
on the Schedule of Exceptions attached hereto as Exhibit D, specifically identifying the relevant subparagraph or subparagraphs hereof, which exceptions shall be deemed to be representations and warranties as if made hereunder, the Company hereby
represents and warrants to the Investors as of the date hereof and as of the Closing as follows: 
  
 2.1 Organization, Good Standing and Qualification. The Company is a corporation duly incorporated, validly existing and in good standing under the
laws of the State of Delaware. Each of the Company and its Subsidiaries has the requisite corporate power and authority to own and operate its properties and assets and to carry on its business as presently conducted and as proposed to be conducted.
Each of the Company and its Subsidiaries is duly qualified to do business as a foreign corporation in each other jurisdiction in which the conduct of its business requires such qualification, except where the failure to so qualify would not
reasonably be expect to have a Material Adverse Effect. 
  
 2.2
Capitalization. As of the time of execution of this Agreement after giving effect to the effectiveness of the Plan and to the events contemplated by the Plan which are to become effective as of the Effective Date (as defined in the Plan),
including without limitation the filing of the Redback Reorganized Certificate of Incorporation, the Reverse Stock Split, the cancellation of the Existing Securities and the issuance of the New Common Stock and the New Warrants (each as defined in
the Plan), the authorized capital stock of the Company consists of 750,001,200 shares of Common Stock, 52,135,000 of which are issued and outstanding, and 10,000,000 shares of preferred stock, par value $0.0001 per share (“Preferred
Stock”), and of which 250,000 are designated as Series A Junior Participating Preferred Stock and 750,000 are designated as Series B Convertible Preferred Stock, none of which are issued and outstanding. 
  

 2 

 The Company has reserved (i) 10,975,610 shares of Common Stock for issuance to employees, consultants and other service
providers pursuant to the Redback Networks Inc. 1999 Stock Incentive Plan, (ii) 1,500,000 shares of Common Stock for issuance pursuant to the Redback Networks Inc. 1999 Employee Stock Purchase Plan, and (iii) 20,438 shares of Common Stock for
issuance pursuant to the Redback Networks Inc. 1999 Directors’ Stock Plan. The Company has reserved an aggregate of 6,736,566 shares of Common Stock for issuance upon the exercise of warrants issued pursuant to the Plan. All issued and
outstanding shares of Common Stock have been duly authorized and validly issued and are fully paid and nonassessable, were issued in compliance with the provisions of any applicable securities laws including any relevant federal or state securities
laws, or pursuant to valid exemptions therefrom, and were issued free of any pre-emptive rights. Except as set forth above, there are no other outstanding rights, options, warrants, preemptive rights, conversion rights, rights of first refusal or
similar rights for the purchase or acquisition from the Company of any securities of the Company nor are there any commitments to issue or execute any such rights, options, warrants, preemptive rights, conversion rights or rights of first refusal.
The consummation of the transactions contemplated by this Agreement and the Warrants will not trigger the anti-dilution provisions or other price adjustment mechanisms of any outstanding rights, options, warrants, preemptive rights, conversion
rights, rights of first refusal or similar rights for the purchase or acquisition from the Company of any securities of the Company. The Company has no commitments, obligations or agreements to repurchase or redeem any of its shares of capital stock
or options, warrants or other rights to acquire capital stock of the Company. The Company has furnished to Latham & Watkins LLP, counsel to the Investors, a true and complete copy of its Amended and Restated Certificate of Incorporation,
including the Certificate of Designation, and Bylaws, each as contemplated to be in effect as of the Closing. 
  
 2.3 Subsidiaries. The Schedule of Exceptions sets forth each of the Company’s Subsidiaries, the type of legal entity and its jurisdiction of
organization. All of the issued and outstanding capital stock or equity interests of the Subsidiaries has been duly authorized and validly issued, and in the case of corporations is fully paid and non-assessable, and in each case, is owned of record
by the Company, or one of the Company’s Subsidiaries, free and clear of all mortgages, liens, loans and encumbrances or any other rights. There are no outstanding rights, options, warrants, preemptive rights, conversion rights, rights of first
refusal or similar rights for the purchase or acquisition from any Subsidiary of any securities of the Subsidiaries nor are there any commitments to issue or execute any such rights, options, warrants, preemptive rights, conversion rights or rights
of first refusal. The Company does not own or control, directly or indirectly, any interest in any other corporation, association, or other business entity. The Company is not a participant in any joint venture, partnership, or similar arrangement.

  
 2.4 Authorization. The Company has the requisite
corporate power and authority to enter into and to consummate the transactions contemplated by this Agreement, the Warrants and the Investor Rights Agreement, in substantially the form attached hereto as Exhibit E (the “Investor
Rights Agreement”) and otherwise to carry out its obligations hereunder and thereunder. All corporate action on the part of the Company, its officers, directors and stockholders necessary for the authorization, execution and delivery of
this Agreement, the Warrants and the Investor Rights Agreement, the performance of all obligations of the Company hereunder and thereunder, the authorization, issuance, sale and delivery of the Shares and the 
  

 3 

 Warrants being sold hereunder and issuance and delivery of the Warrant Shares and the Conversion Shares (as defined
below) has been taken. No approval of the stockholders of the Company is required in connection with this Agreement, the Warrants and the Investor Rights Agreement and the consummation of the transactions contemplated hereby and thereby. This
Agreement, the Warrants and the Investor Rights Agreement have been duly authorized, executed and delivered by the Company and each constitutes, or will constitute when executed and delivered by the parties thereto at the Closing, a valid and
legally binding obligation of the Company, enforceable against the Company in accordance with its respective terms, subject to: (i) judicial principles limiting the availability of specific performance, injunctive relief, and other equitable
remedies; (ii) bankruptcy, insolvency, reorganization, moratorium or other similar laws now or hereafter in effect generally relating to or affecting creditors’ rights; and (iii) limitations imposed by applicable federal and state securities
laws on the enforceability of any indemnification provisions contained in such agreements. 
  
 2.5 Valid Issuance of Shares, Warrants Shares and Conversion Shares. The Shares being purchased by the Investors hereunder, when issued, sold and delivered in accordance with the terms of this Agreement for the
consideration expressed herein, will be duly and validly issued, fully paid, nonassessable, free of the exercise of pre-emptive rights and will be free of restrictions on transfer other than under applicable state and federal securities laws and the
Investor Rights Agreement. The shares of Common Stock issued upon conversion of the Shares (the “Conversion Shares”), when issued in accordance with the Certificate of Designation, and the Warrant Shares when issued in accordance
with the terms of the Warrant, will be duly and validly issued, fully paid, nonassessable, free of the exercise of pre-emptive rights and will be free of restrictions on transfer other than under applicable state and federal securities laws and the
Investor Rights Agreement. The Company has reserved from its duly authorized capital stock a sufficient number of shares of Common Stock for issuance of the Warrant Shares and the Conversion Shares. 
  
 2.6 No Conflicts. The execution, delivery and performance of each of
this Agreement, the Warrants and the Investor Rights Agreement and the consummation of the transactions contemplated hereby and thereby, including the issuance of the Shares, and the Warrants Shares and Conversion Shares, will not result in, or give
rise to, (A) any violation, default, breach, termination or cancellation, right of termination or cancellation, right of acceleration, loss of a material benefit, payment of any penalty, or be in conflict with (in each case, with or without notice
or passage of time, or both) (a) the Certificate of Incorporation or Bylaws or other organizational documents of the Company or its Subsidiaries, (b) the Plan, (c) any material instrument, mortgage, deed of trust, loan, contract, commitment,
judgment, order, writ, decree or contract to which the Company or any of its Subsidiaries is a party or by which the Company or any of its Subsidiaries is bound, or (d) any material provision of any state, federal, or local statute, rule or
regulation applicable to the Company or its Subsidiaries, except in the case of (c) and (d) only for such violations, defaults, breaches, terminations, cancellations, penalties or conflicts which individually or in the aggregate, would not
reasonably be expected to have a Material Adverse Effect or (B) an event that results in the creation of any lien, charge or encumbrance upon any assets of the Company or its Subsidiaries or the suspension, revocation, impairment, forfeiture or
nonrenewal of any permit, license, authorization or approval applicable to the Company or any of its Subsidiaries, their respective business or operations or any of their respective assets or properties. 
  

 4 

 2.7 Consents. No consent, approval, order or authorization of, or registration, qualification,
designation, declaration, notice or filing with, any federal, state or local governmental authority, including the Court, or any other Person on the part of the Company is required in connection with the offer, sale or issuance of the Shares, the
Warrants, the Warrant Shares and the Conversion Shares or the consummation of any other transaction contemplated hereby, except for the filings under applicable federal and state securities laws all of which filings will have occurred within the
appropriate time periods therefor. Assuming that the representations of the Investors set forth in Section 3 below are true and correct, the offer, sale and issuance of the Shares, the Warrants and the Warrant Shares in conformity with the terms of
this Agreement are exempt from the registration requirements of Section 5 of the Securities Act of 1933, as amended (the “Securities Act”), and from qualification requirements under applicable state securities laws. 
  
 2.8 SEC Documents. For the two years preceding the date hereof, the
Company has timely filed all reports, schedules, forms, statements and other documents required to be filed by it with the Securities and Exchange Commission (the “SEC”) pursuant to the Securities Exchange Act of 1934, as amended
(the “Exchange Act”), including under Section 13(a) and 15(d) thereof, and has filed all registration statements and other documents required to be filed by it with the SEC pursuant to the Securities Act. All materials filed by the
Company with the SEC under the Securities Act or the Exchange Act for the two years preceding the date hereof and all amendments thereto, including exhibits included therein and financial statements and schedules thereto and documents incorporated
by reference therein, are hereinafter referred to herein as the “SEC Documents.” The Company has made available to representatives of the Investors all of the SEC Documents. As of their respective dates (or, if amended, then on the
date of such amendment), the SEC Documents complied in all material respects with the requirements of the Exchange Act or the Securities Act, as the case may be, and the rules and regulations of the SEC promulgated thereunder applicable to the SEC
Documents, and none of the SEC Documents, at the time they were filed with the SEC, 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. Any statements made in any such SEC Documents that are or were required to be updated or amended under the Exchange Act or the Securities Act, as the case may be,
have been so updated or amended. 
  
 2.9 Financial
Statements. As of their respective dates, the financial statements of the Company included in the SEC Documents complied in all material respects with applicable accounting requirements and the published rules and regulations of the SEC
applicable with respect thereto. Such financial statements have been prepared in accordance with United States generally accepted accounting principles, consistently applied, during the periods involved (except (i) as may be otherwise indicated in
such financial statements or the notes thereto, or (ii) in the case of unaudited interim statements, to the extent they may not include footnotes or may be condensed or summary statements) and fairly present, in all material respects, the
consolidated financial position of the Company and its Subsidiaries as of the dates thereof and the results of their operations and cash flows for the periods then ended (subject, in the case of unaudited statements, to normal and recurring year-end
audit adjustments which are not material). The Company maintains a system of internal accounting controls sufficient to provide reasonable assurance that (i) transactions are executed in accordance with management’s 
  

 5 

 general or specific authorizations and (ii) transactions are recorded as necessary to permit preparation of financial
statements in conformity with generally accepted accounting principles. 
  
 2.10 No Undisclosed Liabilities. Except (a) as disclosed in the Company’s September 30, 2003 balance sheet or in the SEC Documents, the Plan, the Other Orders (as defined below) or the Disclosure Statements (as defined below),
(b) for liabilities incurred since September 30, 2003 in the ordinary course of business, and (c) for liabilities incurred in connection with this Agreement or the transactions contemplated hereby, the Company and its Subsidiaries do not have any
liabilities, either accrued, contingent or otherwise (whether or not required to be reflected in financial statements in accordance with generally accepted accounting principles), and whether due or to become due, which individually or in the
aggregate are reasonably likely to have a Material Adverse Effect. 
  
 2.11 Plan and Related Filings. The Company has provided to the Investors a complete and accurate copy of (i) the Plan, which includes all supplements and amendments to the Plan, (ii) the order of the Court confirming the Plan (the
“Confirmation Order”), (iii) all other relevant orders of the Court as previously delivered to counsel for the Investors (the “Other Orders”), and (iv) the disclosure statements related to the Plan approved by the Court,
and all amendments and supplements thereto (collectively, the “Disclosure Statements”). No objections or challenges to the Confirmation Order, the Other Orders, the Disclosure Statements or to the Plan were filed with or made to the
Court. 
  
 2.12 Changes. Except as disclosed in the SEC
Documents (excluding any prospective risk factors), the Plan, the Disclosure Statements or the Other Orders, since September 30, 2003, there has not been: 
  
 (a) any change, event or development in the business, assets, liabilities, condition (financial or otherwise), results of operations or prospects of the
Company and its Subsidiaries, including any damage, destruction or loss, whether or not covered by insurance, which have had, or could reasonably be expected to have, individually or in the aggregate, a Material Adverse Effect; 
  
 (b) any incurrence of indebtedness for borrowed money, notes, mortgages or
purchase money indebtedness of the Company or its Subsidiaries in excess of $1,000,000 in the aggregate; 
  
 (c) any waiver or compromise by the Company or any of its Subsidiaries of a valuable right or of a material debt owed to it other than in the ordinary
course of business; 
  
 (d) any material sale or other
disposition of assets, except sales or dispositions in the ordinary course of business; 
  
 (e) any change in accounting methods, principles, policies or practices, change in its independent public accounting firm, disagreement with its independent public accounting firm over the Company’s and its
Subsidiaries’ application of accounting principles or with the preparation of any of their financial statements, notification to the Company’s audit committee of any irregularity with respect to the Company’s or its Subsidiaries’
financial statements, books and records or method of accounting, or any allegation or claim thereof; 
  

 6 

 (f) any written notice from the SEC in connection with any investigation or action by the SEC which
investigation or action seeks to, or could reasonably be expected to result in, the restatement by the Company of any of its current or previously disclosed financial statements, and to the actual knowledge of any of the executive officer of the
Company, no such investigation or action has been threatened by, or is being considered by, the SEC and no facts or circumstances exist that could reasonably be expected to result in any such investigation, action or restatement of financial
statements; 
  
 (g) other than as part of the Plan, any material
change to a material contract or agreement by which the Company or any of its Subsidiaries or any of their assets is bound or subject other than in the ordinary course of business; 
  
 (h) any material change in any compensation arrangement or agreement with any key technical employee, executive officer or
director of the Company or any of its Subsidiaries or any holder of more than 5% of the outstanding capital stock of the Company other than in the ordinary course of business; 
  
 (i) any sale, assignment or transfer of any patents, trademarks, copyrights, trade secrets or other intangible assets other
than pursuant to non-exclusive licenses in the ordinary course of business; 
  
 (j) any resignation or termination of employment of any officer or key technical employee of the Company or any of its Subsidiaries; and the Company is not aware of any impending resignation or termination of
employment of any such officer or key technical employee; 
  
 (k)
any loans or guarantees made by the Company or any of its Subsidiaries to or for the benefit of their employees, officers or directors or any members of their immediate families, other than (i) travel advances and other advances made in the ordinary
course of business and (ii) loans to employees, officers or directors in connection with the early exercise of stock options granted pursuant to the Company’s stock option plans; 
  
 (l) any declaration, setting aside or payment or other distribution in respect to any of the Company’s capital stock,
or any direct or indirect redemption, purchase or other acquisition of any of such stock by the Company; or 
  
 (m) any arrangement or commitment by the Company to do any of the things described in this Section 2.12. 
  
 2.13 Litigation. Except as disclosed in the SEC Documents, there is no
material action, suit, proceeding, arbitration, inquiry, notice of violation or investigation (including, without limitation, any suit, proceeding or investigation involving the prior employment of any of the Company’s or its Subsidiaries’
employees, their use in connection with the Company’s or its Subsidiaries’ business of any information or techniques allegedly proprietary to any of their former employers, or their obligations under any agreements with 
  

 7 

 prior employers) pending or, to the Company’s knowledge, currently threatened against the Company, its Subsidiaries
or their respective properties, before or by any court, administrative agency, other governmental or regulatory body or arbitrator. The Company and its Subsidiaries are not a party or subject to, and none of the assets of the Company or its
Subsidiaries are bound by, the provisions of any material order, writ, injunction, judgment or decree of any court or government agency or instrumentality. There is no material action, suit, proceeding or investigation by the Company or its
Subsidiaries currently pending which the Company or its Subsidiaries intends to initiate. 
  
 2.14 Intellectual Property. To the knowledge of the Company, the Company and its Subsidiaries own or have the right to use all material patents, trademarks, service marks, trade names, copyrights, trade
secrets, licenses, information, proprietary rights and processes necessary or material for their business as now conducted (the “Company Intellectual Property Rights”). The Company has not received any written communications (i)
challenging the validity, effectiveness or ownership by the Company or its Subsidiaries of any of the Company Intellectual Property Rights, or (ii) that the Company or its Subsidiaries is in material default with respect to any license granting
Company Intellectual Property Rights to the Company or its Subsidiaries. The Company has not received any written communications alleging, nor to the Company’s knowledge has, it or any of its Subsidiaries violated any of the patents,
trademarks, service marks, trade names, copyrights or trade secrets or other proprietary rights or processes of any other Person, and to the knowledge of the Company, neither it nor any of its Subsidiaries is infringing or violating such rights of
any other Person, that would, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect. 
  
 2.15 Employees. To the Company’s knowledge, (i) none of the Company’s or its Subsidiaries’ employees are obligated under any
contract (including licenses, covenants or commitments of any nature) or other agreement, or subject to any judgment, decree or order of any court or administrative agency, that would interfere with the use of his or her employment obligations to
the Company or its Subsidiaries or that would conflict with the Company’s and its Subsidiaries’ business as now conducted, (ii) the carrying on of the Company’s and its Subsidiaries’ business by the employees of the Company and
its Subsidiaries, and the conduct of the Company’s or its Subsidiaries’ business as proposed, will not conflict with or result in a breach of the terms, conditions or provisions of, or constitute a default under, any contract, covenant or
instrument under which any of such employees is now obligated, and (iii) none of the Company’s or its Subsidiaries’ current employees is, by virtue of such employee’s activities in connection with the Company’s or its
Subsidiaries’ business, violating, infringing or misappropriating any patents, trademarks, service marks, trade names, copyrights, trade secrets, licenses, information, proprietary rights or processes of any former employer of such employee, in
the case of (i), (ii) or (iii) that would, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect. 
  
 2.16 Compliance with Other Instruments and Laws. The Company is not in violation or default of any provision of its Certificate of Incorporation or
Bylaws, each as amended and in effect as of the Closing. To the Company’s knowledge, neither the Company nor any of its Subsidiaries are in breach, violation or default (with or without notice or passage of time, or both), nor has the Company
or its Subsidiaries received notice that it is in breach of, in violation of or default under (i) any provision of any instrument, mortgage, deed of trust, loan, 
  

 8 

 contract, commitment, judgment, decree, order or obligation to which they are a party or by which they or any of their
properties or assets are bound, which breach, violation or default would, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect, or, (ii) any provision of any federal, state or local law, statute, rule,
governmental regulation, order of any court, arbitrator or government body to which the Company or its Subsidiaries is subject, which breach, violation or default would, individually or in the aggregate, reasonably be expected to have a Material
Adverse Effect.  
  
 2.17 Permits. The Company and
its Subsidiaries have all franchises, permits, licenses and any similar authority necessary for the conduct of their business as now being conducted, the lack of which, individually or in the aggregate, could reasonably be expected to have a
Material Adverse Effect, and the Company and its Subsidiaries believe they can obtain, without undue burden or expense, any similar authority for the conduct of their business as planned to be conducted. Neither the Company nor any of its
Subsidiaries is in default in any material respect under any of such franchises, permits, licenses or other similar authority and has not received any written notice alleging that they are in default or violation of such franchises, permits,
licenses or similar authority. 
  
 2.18 Agreements. The
contracts and agreements filed as exhibits to the SEC Documents and all contracts and agreements that are material to the conduct of the Company’s business as presently conducted or proposed to be conducted or otherwise deemed to be material by
the Company are collectively referred to as the “Material Contracts.” Each Material Contract, other than any Material Contract that was terminated, cancelled, rejected or not assumed by the Company pursuant to the Plan (i) is valid
and binding on the respective parties thereto and is in full force and effect, and (ii) upon consummation of the transactions contemplated by this Agreement, shall continue in full force and effect, without penalty or other adverse consequence.

  
 2.19 Taxes. The Company and its Subsidiaries have filed
all necessary federal, state, foreign and local property, income, franchise, sales, and use tax returns, which were true and correct in all material respects on the date of each such filing, and have paid all taxes shown as due thereon or otherwise
owed by each of them to any taxing authority except those contested in good faith and for which appropriate amounts have been reserved in accordance with generally accepted accounting principles. There is no tax deficiency that has been, or might
be, asserted against the Company or any of its Subsidiaries that, individually or in the aggregate, would reasonably be expected to have a Material Adverse Effect. 
  
 2.20 Related Party Transactions. Except as disclosed in the SEC Documents, no holder of more than 5% of the
outstanding capital stock of the Company and no employee, officer, or director of the Company or any of its Subsidiaries or member of his or her immediate family is indebted to the Company or its Subsidiaries, nor is the Company or its Subsidiaries
indebted (or committed to make loans or extend or guarantee credit) to any of them. 
  
 2.21 Registration Rights; Nasdaq. Except as contemplated by the Investor Rights Agreement, no Person has any outstanding registration rights, including piggyback rights, with respect to any securities of the
Company. Upon the filing of the Company’s Form 10-K for the fiscal year ended December 31, 2003, the Company will be eligible to register the resale of its Common Stock and the Warrants under Form S-3 promulgated under the Securities Act. As of

  

 9 

 the date hereof, the Company’s Common Stock is listed on the Nasdaq National Market, and no event has occurred, and
the Company is not aware of any event that is reasonably likely to occur, that would result in the Common Stock being delisted from the Nasdaq National Market. The issuance and sale of the Shares and Warrants in conformity with the terms of this
Agreement do not, and the issuance of the Warrant Shares and Conversion Shares will not, contravene the rules and regulations of the Nasdaq Stock Market. 
  
 2.22 Disclosure. The representations and warranties contained in this Agreement and the exhibits attached hereto and any certificate furnished or
to be furnished to Investors at Closing do not contain any untrue statement of a material fact or, taken together with the SEC Documents, omit to state a material fact necessary in order to make the statements contained herein or therein not
misleading in light of the circumstances under which they were made.  
  
 2.23 Delaware Section 203. The Board of Directors of the Company, at a meeting duly called and held on January 2, 2004 , has approved, (i) the terms of this Agreement, the Warrants, the Certificate of
Designation and the Investor Rights Agreement, and the consummation of the transactions contemplated hereby and thereby (including without limitation the sale and issuance of the Shares and the issuance of the Conversion Shares upon conversion of
the Shares), and such approval constitutes approval of such transactions by the Board of Directors of the Company under the provisions of Section 203 of the Delaware General Corporation Law, and (ii) in addition to the shares of Common Stock
obtained upon conversion of the Shares, the purchase or other acquisition, whether in market transactions, privately negotiated transactions or otherwise, by the Investors of up to 3,000,000 shares (as adjusted for any stock dividends paid in common
stock, and any combinations, stock splits, recapitalizations and the like each with respect to the Company’s Common Stock) of Common Stock (the “Market Purchases”), and such approval constitutes approval of such transactions by
the Board of Directors of the Company under the provisions of Section 203 of the Delaware General Corporation Law. 
  
 2.25 Shareholder Rights Plan. The Board of Directors of the Company, at a meeting duly called and held on January 2, 2004, has amended the
Company’s Shareholder Rights Plan (the “Amendment”), so as to render it inapplicable to the Investors with respect to the purchase of the Shares and the Warrants and the issuance of the Conversion Shares and Warrant Shares, and
the Market Purchases. The Company has provided a true and correct copy of the Amendment to the Investors. 
  
 2.26 Plan Effectiveness. All conditions to the Effective Date have been satisfied prior to the date hereof, and all of the events contemplated by
the Plan which are to occur or become effective on the Effective Date shall have become effective or occurred, including without limitation the filing of the Company’s Amended and Restated Certificate of Incorporation, the Reverse Stock Split
(as defined in the Plan), the cancellation of the Company’s obligations under the 5% Convertible Subordinated Notes, due on April 1, 2007 and the issuance of shares of Common Stock in respect thereof, and the cancellation of the Old Redback
Common Stock Related Interests (as defined in the Plan), and no actions, motions, suits or disputes is pending or threatened with respect to the Confirmation Order, occurrence of the Effective Date, or any of the events contemplated by the Plan
which are to occur or become 
  

 10 

 effective on the Effective Date, and the Company does not have any reason to believe that any such action, motion, suit
or dispute will be filed or arise. The transactions contemplated by this Agreement and the Investor Rights Agreement do not conflict with or violate the Plan, the Confirmation Order or the Lock-Up Agreements (as defined in the Plan). None of the
Shares, Warrants, Warrant Shares and Conversion Shares shall constitute “Old Redback Interests,” “Post-Split Common Stock” or “Interests” under the Plan. 
  
 2.27 Financial Projections. Prior to the date hereof, the Company has provided the Investors with its most current
financial projections for the Company (the “Financial Projections”). The Financial Projections were prepared in good faith, are based on assumptions that the Company believes to be reasonable as of the date of this Agreement.
Notwithstanding the foregoing, however, the Company makes no representation or warranty with respect to the Company’s ability to achieve such projections. 
  
 3. Representations and Warranties of the Investors. Each Investor hereby, severally and not jointly, represents and
warrants as of the date hereof as follows: 
  
 3.1
Experience; Accredited Investor. Such Investor is experienced in evaluating companies such as the Company, and has either individually or through its current officers such knowledge and experience in financial and business matters that such
Investor is capable of evaluating the merits and risks of such Investor’s prospective investment in the Company, and has the ability to bear the economic risks of the investment. Such Investor is an “accredited investor” within the
meaning of Rule 501 of Regulation D promulgated under the Securities Act. 
  
 3.2 Purchase Entirely for Own Account. Such Investor is acquiring the Shares, the Warrants, Conversion Shares and the Warrant Shares for investment for such Investor’s own account and not with the view to,
or for resale in connection with, any distribution thereof, except for transfers to affiliated fund partnerships. Such Investor understands that the Shares, the Warrants, the Conversion Shares and the Warrant Shares have not been registered under
the Securities Act by reason of a specific exemption from the registration provisions of the Securities Act which depends upon, among other things, the bona fide nature of the investment intent as expressed herein. Such Investor further represents
that it does not have any contract, undertaking, agreement or arrangement with any Person to sell, transfer or grant participation to any third Person with respect to any of the Shares, the Warrants, Conversion Shares and the Warrant Shares. Such
Investor understands and acknowledges that the offering of the Shares, the Warrants, the Conversion Shares and the Warrant Shares pursuant to this Agreement will not be registered under the Securities Act on the ground that the sale provided for in
this Agreement and the issuance of securities hereunder is exempt from the registration requirements of the Securities Act. 
  
 3.3 Rule 144. Such Investor acknowledges that the Shares, the Warrants, Conversion Shares and the Warrant Shares must be held indefinitely unless
subsequently registered under the Securities Act or an exemption from such registration is available. Such Investor is aware of the provisions of Rule 144 promulgated under the Securities Act which permit limited resale of shares purchased in a
private placement subject to the satisfaction of certain conditions. Such Investor understands and acknowledges that the certificate evidencing its Shares will be imprinted with certain legends, including but not limited to, the form of legend set
forth in the Investor Rights Agreement. 
  

 11 

 3.4 Access to Data. Such Investor has received and reviewed information about the Company and has
had an opportunity to discuss the Company’ business, management and financial affairs with its management and to review the Company’s facilities. Nothing contained in this Section 3.4 shall limit in any respect the Company’s
representations and warranties contained in this Agreement. 
  
 3.5 Authorization. This Agreement has been duly authorized, executed and delivered by such Investor and constitutes a valid and legally binding obligation of such Investor, enforceable against such Investor in accordance with its
terms subject to: (i) judicial principles limiting the availability of specific performance, injunctive relief, and other equitable remedies; (ii) bankruptcy, insolvency, reorganization, moratorium or other similar laws now or hereafter in effect
generally relating to or affecting creditors’ rights; and (iii) limitations on the enforceability of any indemnification provisions. 
  
 4. Conditions of Investor’s Obligations at Closing. The obligation of each Investor to purchase Shares and Warrants at the Closing is subject
to the fulfillment or waiver by the Investor on or before the Closing of each of the following conditions, the waiver of which shall not be effective against any Investor who does not consent in writing thereto: 
  
 4.1 Representations and Warranties. The representations and warranties
of the Company contained in Section 2 shall be true and correct in all material respects on and as of the Closing with the same effect as though such representations and warranties had been made on and as of the date of such Closing, except for
changes contemplated by this Agreement. 
  
 4.2
Performance. The Company shall have performed and complied in all material respects with all covenants, agreements, obligations and conditions contained in this Agreement that are required to be performed or complied with or by it on or
before the Closing. 
  
 4.3 Compliance Certificate.
The Company shall deliver to each Investor at the Closing a certificate of the President of the Company dated the date of the Closing stating that (i) the conditions specified in Sections 4.1 and 4.2 have been fulfilled and (ii) the events
contemplated by the Plan have become effective. 
  
 4.4
Blue Sky. The Company shall have obtained all necessary permits and qualifications, if any, or secured an exemption therefrom, required by any state for the offer and sale of the Shares and the Warrants. 
  
 4.5 Investor Rights Agreement. The Company and each Investor shall
have entered into the Investor Rights Agreement. 
  
 4.6
Opinion of Company Counsel. The Company shall have provided an opinion addressed to the Investors rendered by its legal counsel in form and substance reasonably satisfactory to the Investors, in substantially the form attached hereto as
Exhibit F. 
  

 12 

 4.7 Regulatory Approvals. All consents, approvals, filings and registrations with, and
notifications to, all federal, state, local and foreign governmental or regulatory agencies, authorities, instrumentalities or other bodies having jurisdiction over the parties hereto required for the consummation of the transactions contemplated
hereby have been obtained or made and shall be in full force and effect. 
  
 4.8 Legal Proceedings. No court or governmental or regulatory authority of competent jurisdiction, including the Court, shall have enacted, issued, promulgated, enforced or enacted any law of order (whether
temporary, preliminary or permanent) or taken any other action which prohibits or makes illegal consummation of the transactions contemplated by this Agreement, and there shall be no suit, claim, action, proceeding or governmental investigation
pending against the Company or the Investors which seeks to challenge the transactions contemplated by this Agreement. 
  
 4.9 Certificate of Designation. The Certificate of Designation shall have been duly filed with the Secretary of State of the State of Delaware.
 
  
 4.10 Board Representative; Indemnification
Agreement. The Board of Directors of the Company shall have appointed John Drew to the Board of Directors of the Company as the Series B Designee (as such term is defined in the Certificate of Designation), to take effect immediately following
the Closing and contingent upon the Closing, and the Company shall enter into an Indemnification Agreement with John Drew in form and substance reasonably acceptable to the Investors. 
  
 4.11 Listing. The Warrant Shares and the Conversion Shares shall have been approved for listing, subject only to
notice of issuance, on the Nasdaq National Market. 
  
 5.
Conditions of the Company’s Obligations at Closing. The obligations of the Company to sell Shares to each Investor at the Closing are subject to the fulfillment, or waiver by the Company, on or before the Closing of each of the following
conditions by that Investor: 
  
 5.1 Representations and
Warranties. The representations and warranties of such Investor contained in Section 3 shall be true and correct in all material respects on and as of the Closing with the same effect as though such representations and warranties had been made
on and as of the Closing. 
  
 5.2 Performance. Such
Investor shall have performed and complied in all material respects with all covenants, agreements, obligations and conditions contained in this Agreement that are required to be performed or complied with or by it on or before the Closing.

  
 5.3 Blue Sky. The Company shall have obtained all
necessary permits and qualifications, if any, or secured an exemption therefrom, required by any state for the offer and sale of the Shares and the Warrants. 
  
 5.4 Investor Rights Agreement. The Company and each Investor shall have entered into the Investor Rights
Agreement. 
  

 13 

 5.5 Regulatory Approvals. All consents, approvals, filings and registrations with, and
notifications to, all federal, state, local and foreign governmental or regulatory agencies, authorities, instrumentalities or other bodies having jurisdiction over the parties hereto required for the consummation of the transactions contemplated
hereby have been obtained or made and shall be in full force and effect. 
  
 5.6 Legal Proceedings. No court or governmental or regulatory authority of competent jurisdiction, including the Court, shall have enacted, issued, promulgated, enforced or enacted any law of order (whether
temporary, preliminary or permanent) or taken any other action which prohibits or makes illegal consummation of the transactions contemplated by this Agreement, and there shall be no suit, claim, action, proceeding or governmental investigation
pending against the Company which seeks to challenge the transactions contemplated by this Agreement. 
  
 5.7. Certificate of Designation. The Certificate of Designation shall have been duly filed with the Secretary of State of the State of Delaware.

  
 6. Post-Closing Covenants. 
  
 6.1 Board Representative; Indemnification Agreement. Immediately after
the Closing, once John Drew shall become a member of the Board of Directors of the Company as the Series B Designee (as such term is defined in the Certificate of Designation), the Company shall enter into an Indemnification Agreement with John Drew
in form and substance reasonably acceptable to the Investors. 
  
 6.2 Directors and Officers Insurance. The Company has as of the date hereof directors and officers insurance from a financially sound and reputable insurer in the amount of not less than $5,000,000. The Company shall maintain such
policy at all times that a “Series B Designee” (as such term is defined in the Certificate of Designation) serves on the Company’s Board of Directors. 
  
 6.3 Nomination of Director. If the Series B Preferred Stock is no longer outstanding, for so long as the Investors
own 7.5% or more of the outstanding Common Stock of the Company, the Company shall nominate, or shall cause to be nominated, an individual to be designated by the Investors owning a majority of the shares of Common Stock then owned by the Investors
for election to the Board of Directors of the Company and shall solicit, or cause to be solicited, proxies to elect such individual to the same extent it does so for the other individuals nominated by the Company for election to the Board of
Directors. For purposes of this Section 6.3, the number of shares of Common Stock owned by any Investor shall be deemed to include any shares of Common Stock issuable upon conversion of Shares or exercise of Warrants then owned by such Investor.

  
 7. Miscellaneous. 
  
 7.1 Governing Law. This Agreement shall be governed in all respects by
the laws of the State of California without regard to choice of laws or conflict of laws provisions thereof.  
  

 14 

 7.2 Survival. The representations, warranties, covenants and agreements made herein shall survive
any investigation made by any Investor and shall survive for eighteen (18) months following the Closing. All statements of the Company as to factual matters contained in any certificate or exhibit delivered by or on behalf of the Company pursuant
hereto shall be deemed to be the representations and warranties of the Company hereunder as of such date of such certificate or exhibit. 
  
 7.3 Successors and Assigns. Except as otherwise provided herein, this Agreement and the rights and obligations of the parties hereunder shall inure
to the benefit of and be binding upon the respective successors and assigns of the parties hereto; provided, however, that prior to the Closing the rights of an Investor to purchase Shares shall not be assignable without the consent of the
Company. 
  
 7.4 Entire Agreement; Amendment. This
Agreement and the other documents delivered pursuant hereto constitute the full and entire understanding and agreement among the parties with regard to the subject matter hereof and thereof. Any prior agreements, understanding or representations
with respect to the subject matter heretofore superseded by this Agreement and shall have no further force or effect. Neither this Agreement nor any term hereof may be amended, waived, discharged or terminated other than by a written instrument
signed by the party against whom enforcement of any such amendment, waiver, discharge or termination is sought. Notwithstanding the foregoing, holders of a majority of the outstanding Shares may waive or amend, on behalf of all Investors and other
holders of Shares, any provisions hereof benefiting the Investors so long as the effect thereof will be that all such Investors and other holders of Shares will be treated equally. 
  
 7.5 Notices, Etc. All notices and other communications required or permitted hereunder shall be in writing and shall
be (a) mailed by registered or certified mail, postage prepaid, return receipt requested, (b) delivered by a nationally recognized overnight courier, (c) sent by confirmed facsimile or (d) otherwise delivered by hand or by messenger, addressed (i)
if to an Investor, at such Investor’s address set forth on Exhibit A, or at such other address as such Investor shall have furnished to the Company in writing, (ii) if to any other holder of any Shares, at such address as such holder
shall have furnished the Company in writing, or, until any such holder so furnishes an address to the Company, then to and at the address of the last holder of such Shares who has so furnished an address to the Company, or (iii) if to the Company,
at its address set forth on the signature page of this Agreement addressed to the attention of the Corporate Secretary, or at such other address as the Company shall have furnished to the Investors, with a copy to Wilson, Sonsini, Goodrich &
Rosati, 650 Page Mill Road, Palo Alto, California 94304, facsimilie (650) 493-6811, Attention: Page Mailliard, Esq. If notice is provided by mail, notice shall be deemed to be given 48 hours after proper deposit in a mailbox; if by overnight
courier, notice shall be deemed to be given 24 hours after deposit; if by facsimile, upon completion of such facsimile transmission as conclusively evidenced by the transmission receipt; and if by hand or messenger, upon receipt. 
  
 7.6 Delays or Omissions. No delay or omission to exercise any right,
power or remedy accruing to any holder of any Shares upon any breach or default of the Company under this Agreement shall impair any such right, power or remedy of such 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  
  

 15 

 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 any holder of any breach or default under this Agreement, or any waiver on the part of any holder of
any provisions or conditions of this Agreement, must be in writing and shall be effective only to the extent specifically set forth in such writing or as provided in this Agreement. All remedies, either under this Agreement or by law or otherwise
afforded to any holder, shall be cumulative and not alternative. 
  
 7.7 Finder’s Fee. The Company shall indemnify and hold each of the Investors harmless and each Investor shall, severally and not jointly, indemnify and hold the Company harmless from any liability for any commission or
compensation in the nature of a finder’s fee in connection with the sale of the Shares (including the costs, expenses and legal fees of defending against such liability) for which the Company or such Investor, or any of their respective
partners, members, employees, or representatives, as the case may be, is responsible. 
  
 7.8 Counterparts. This Agreement may be executed in any number of counterparts and signatures may be delivered by facsimile, each of which may be executed by less than all Investors, each of which shall be
enforceable against the parties actually executing such counterparts, and all of which together shall constitute one instrument. 
  
 7.9 Severability. If any provision of this Agreement becomes or is declared by a court of competent jurisdiction to be illegal, unenforceable or
void, portions of such provision, or such provision in its entirety, to the extent necessary, shall be severed from this Agreement and the balance of this Agreement shall be enforceable in accordance with its terms. 
  
 7.10 Titles and Subtitles. The titles and subtitles used in this
Agreement are used for convenience only and are not to be considered in construing or interpreting this Agreement. 
  
 7.11 Legal Fees. If any action at law or in equity (including arbitration) is necessary to enforce or interpret the terms of this Agreement, the
prevailing party shall be entitled to reasonable attorneys’ fees, costs and necessary disbursements in addition to any other relief to which such party may be entitled. 
  
 7.12 Expenses. The Company shall reimburse the Investors for the reasonable fees and expenses (including reasonable
fees and expenses of its legal counsel) incurred by the Investors in connection with the transactions contemplated by this Agreement, not to exceed $100,000. 
  
 7.13 Publicity. Except as required by law, no party hereto shall issue any press release or make any public statement
regarding the transactions contemplated hereby without the prior approval of the other parties, and the parties hereto shall issue a mutually acceptable press release as soon as practicable after the Closing. Notwithstanding the foregoing, the
Company shall be permitted to make a public statement without obtaining the consent of the Investors if (a) the disclosure is required by the continued listing requirements of the Nasdaq National Market and (b) the Company has used its reasonable
best efforts to consult with the Investors about the form and substance of such disclosure. 
  

 16 

 7.14 Definitions. For purposes of this Agreement: 
  
 (a) “Material Adverse Effect” means a material adverse
effect on the business, assets, liabilities, financial condition or results of operations of the Company and its Subsidiaries, taken as a whole. 
  
 (b) “Person” means an individual, corporation, partnership, limited liability company, joint venture, association, trust, unincorporated
organization or other entity. 
  
 (c)
“Subsidiary” of any Person means, with respect to such Person, any corporation, partnership, joint venture or other legal entity or which such Person (either alone or through or together with any other Subsidiary), owns, directly or
indirectly, 50% or more of the stock or other equity interests the holders of which are generally entitled to vote for the election of the Board of Directors or other governing body of such corporation or other legal entity. 
  

 17 

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

  

	
	 THE COMPANY:

	
	REDBACK NETWORKS INC.
		
	By:	 	 /s/ Thomas L. Cronan III

	 Name:
	 	 Thomas L. Cronan III

	 Title:
	 	 Senior Vice President of Finance and
 Administration and Chief Financial
 Officer

		
	 Address:
	 	 300 Holger Way
 San Jose, CA 95134-1362
 Facsimile: (408) 750 5195
 Attention: General Counsel

 THE INVESTORS: 
  

TCV IV, L.P. 
  
 By: Technology Crossover Management IV, L.L.C. 
 Its: General Partner 
  
 By: /s/ Robert C.
Bensky                             
 Name: Robert C. Bensky 
 Title:   Attorney in Fact 
  
 TCV IV STRATEGIC PARTNERS, L.P. 
  
 By: Technology Crossover Management IV, L.L.C. 
 Its: General Partner 
  
 By: /s/ Robert C.
Bensky                             
 Name: Robert C. Bensky 
 Title:   Attorney in Fact 

 EXHIBIT A 
  
 SCHEDULE OF INVESTORS 
  

	 Investor

	  	Shares of Series B
Preferred Stock

	  	Warrant Shares

	 TCV IV, L.P.
	  	628,320	  	1,570,800
	 TCV IV Strategic Partners, L.P.
	  	23,429	  	58,573
	 	  	
	  	

	 Total
	  	651,749	  	1,629,373
	 	  	
	  	

  
 Mailing Address for each Investor:

  
 Technology Crossover Ventures 
 528 Ramona Street 
 Palo Alto, CA 94301

 Attention: John L. Drew 
 Phone: (650) 614-8219 
 Fax: (650) 614-8222 
  

with a copy to: 
  
 Technology Crossover Ventures 
 56 Main
Street, Suite 210 
 Millburn, NJ 07041 
 Attention: Robert C. Bensky 
 Phone: (973) 467-5320 
 Fax: (973) 467-5323 

 EXHIBIT B 
  
 FORM OF WARRANT 

 EXHIBIT C 
  
 CERTIFICATE OF DESIGNATION 

 EXHIBIT D 
  
 SCHEDULE OF EXCEPTIONS 

 EXHIBIT E 
  
 INVESTOR RIGHTS AGREEMENT 

 EXHIBIT F 
  
 FORM OF LEGAL OPINION

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