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EXHIBIT 3.2
 FOURTH AMENDED AND RESTATED BYLAWS
 OF
 SOURCEFIRE, INC.  a Delaware Corporation




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Table of Contents
 ARTICLE 1 - StockholdersSection 1.1     Place of MeetingsSection 1.2     Annual MeetingSection 1.3     Special MeetingsSection 1.4     Notice of MeetingsSection 1.5     Voting ListSection 1.6     QuorumSection 1.7     AdjournmentsSection 1.8     Voting and ProxiesSection 1.9     Action at MeetingSection 1.10   Action without MeetingSection 1.11   Stockholder Proposals at Annual MeetingsARTICLE 2 - DirectorsSection 2.1     General PowersSection 2.2     Number, Classes and Term of OfficeSection 2.3     Nomination, Election and QualificationSection 2.4     VacanciesSection 2.5     ResignationSection 2.6     Regular MeetingsSection 2.7     Special MeetingsSection 2.8     Notice of Special MeetingsSection 2.9     Meetings by Telephone Conference CallsSection 2.10   QuorumSection 2.11   Action at MeetingSection 2.12   Action by ConsentSection 2.13   RemovalSection 2.14   CommitteesSection 2.15   Compensation of DirectorsARTICLE 3 - OfficersSection 3.1     EnumerationSection 3.2     ElectionSection 3.3     QualificationSection 3.4     TenureSection 3.5     Resignation and Removal
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Section 3.6     VacanciesSection 3.7     Chairman of the Board and Vice-Chairman of the BoardSection 3.8     Chief Executive OfficerSection 3.9     PresidentSection 3.10   Chief Operating OfficerSection 3.11   Chief Financial OfficerSection 3.12   Vice PresidentsSection 3.13   Secretary and Assistant SecretariesSection 3.14   Treasurer and Assistant TreasurersSection 3.15   SalariesARTICLE 4 - Capital StockSection 4.1     Issuance of StockSection 4.2     Certificates of StockSection 4.3     TransfersSection 4.4     Lost, Stolen or Destroyed CertificatesSection 4.5     Record DateARTICLE 5 - IndemnificationSection 5.1     Right to IndemnificationSection 5.2     Authority to Advance ExpensesSection 5.3     Right of Claimant to Bring SuitSection 5.4     Provisions NonexclusiveSection 5.5     Authority to InsureSection 5.6     Survival of RightsSection 5.7     Settlement of ClaimsSection 5.8     Effect of AmendmentSection 5.9     SubrogationSection 5.10   No Duplication of PaymentsARTICLE 6 - General ProvisionsSection 6.1     Fiscal YearSection 6.2     Corporate SealSection 6.3     Waiver of NoticeSection 6.4     Voting of SecuritiesSection 6.5     Evidence of AuthoritySection 6.6     Certificate of IncorporationSection 6.7     Transactions with Interested PartiesSection 6.8     SeverabilitySection 6.9     Pronouns
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ARTICLE 7 - AmendmentsSection 7.1     By the Board of DirectorsSection 7.2     By the Stockholders
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(A Delaware Corporation)
 ARTICLE 1  Stockholders
 Place of Meetings. Corporation
 Annual Meeting.
 Special Meetings. DGCL
 Notice of Meetings.
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Voting List.
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Quorum.
 Adjournments
 Voting and Proxies.
 Action at Meeting.
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Action without Meeting.
 Stockholder Proposals at Annual Meetings.
  provided however
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ARTICLE 2  Directors
 General Powers.
 Number, Classes and Term of Office
   Nomination, Election and Qualification
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Vacancies.
 Resignation.
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Regular Meetings. provided
 Special Meetings.
 Notice of Special Meetings.
 Meetings by Telephone Conference Calls.
 Quorum.
 Action at Meeting.
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Action by Consent.
 Removal.
 Committees
 Audit Committee
 Compensation Committee
 Nominating and Governance Committee
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Other Committees
 Compensation of Directors.
 ARTICLE 3  Officers
 Enumeration.
 Election.
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Qualification.
 Tenure.
 Resignation and Removal.
   Vacancies.
 Chairman of the Board and Vice-Chairman of the Board.
 Chief Executive Officer.
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President.
 Chief Operating Officer.
 Chief Financial Officer.
 Vice Presidents.
 Secretary and Assistant Secretaries.
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         Treasurer and Assistant Treasurers.
  Salaries.
 ARTICLE 4  Capital Stock
 Issuance of Stock.
 Certificates of Stock.
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Transfers.
 Lost, Stolen or Destroyed Certificates.
 Record Date.
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        provided however
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ARTICLE 5  Indemnification
 Right to Indemnification. Proceeding Agent Expenses
 Authority to Advance Expenses.
 Right of Claimant to Bring Suit.
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Provisions Nonexclusive.
 Authority to Insure.
 Survival of Rights.
 Settlement of Claims.
 Effect of Amendment.
 Subrogation.
 No Duplication of Payments.
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ARTICLE 6  General Provisions
 Fiscal Year.
 Corporate Seal.
 Waiver of Notice.
 Voting of Securities.
 Evidence of Authority.
 Certificate of Incorporation.
 Transactions with Interested Parties.
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Severability.
 Pronouns.
 ARTICLE 7  Amendments
 By the Board of Directors.
 By the Stockholders.
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