This document provides an overview of open source software, including its history and definition. It discusses the open source development model and licensing options for open source software. Some key points covered include: - Open source software is software with source code that is made available under a license permitting users to study, change, and improve the design. It launched in 1998 to avoid ambiguity of the term "free software". - Common open source licenses include the Apache License, BSD licenses, GPL, LGPL, MIT license, and MPL. Licenses determine how the software can be used and distributed. - Open source software has advantages like lower costs, improved security from many eyes reviewing code, and flexibility for vendors. Disadvantages

1. Open Source SoftwareTahaPatniHector Lopez ValenciaDecember 11th 2009

2. Table of Contents What is Open Source SoftwareHistoryOpen Source DefinitionOpen Source Licensing Open Source vs. Other SoftwareHow Open Source Software is developedPros and ConsConclusion ReferencesThank You and Questions

3. What is Open Source SoftwareOpen Source Software: “Open source usually refers to software that is released with source code under a license that ensures that derivative works will also be available as source code, protects certain rights of the original authors, and prohibits restrictions on how the software can be used or who can use it.”(1)

4. History Open Source Movement Launched in 1998 By Eric S Raymond and othersFree Software was too ambiguous Open Source Definition was IntroducedOSI was formed (2)

5. Common open source softwareFirefoxVLC media playerThunderbirdphBB bulletin boards BittorrentLinux

6. Open Source Definition Free Redistribution

7. Source Code

8. Derived Works

9. Integrity of the Author’s Source Code

10. No Discrimination Against Person or Groups

11. No Discrimination of Fields Endeavour

12. Distribution of License

13. License must not be Specific to a Product

14. License must not restrict other Software

15. License must be Technology Neutral (2) Open Source LicenseA license defines the rights and obligations that a licensor grants to a licensee. Open Source licenses grant licensees the right to copy, modify and redistribute source code (or content). These licenses may also impose obligations. (4)The License decides the Rules the community Lives byChoosing the Right LicenseOutside Contribution Proprietary Forks (5)OSI Approves all Software’s License

16. Most Common licenses Apache License: 2.0BSD LicensesGNU General Public Licenses (GPL)GNU Library or “Lesser” General Public LicenseMITT LicenseMozilla Public License (MPL)Eclipse Public License