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 .:: Document Index ::.
*The Open Source Definition
*The Halloween Documents
*OSI Press Releases
*OSI Certification Mark
*OSI Approved Licenses
*Peru prefers Open Source
*OSI's History in connection to OSI Site History
*Graphics and Trademarks

Policy Statements:
License Proliferation

 .:: OSD change log ::.
*1.0 identical to DFSG, except for addition of MPL and QPL to clause 10.
*1.1 added LGPL to clause 10.
*1.2 added public-domain to clause 10.
*1.3 retitled clause 10 and split off the license list, adding material on procedures.
*1.4 Now explicit about source code requirement for PD software.
*1.5 allow "reasonable reproduction cost" to meet GPL terms.
*1.6 Edited section 10; this material has moved.
*1.7 Section 10 replaced with new "Conformance" section.
*1.8 Section 1: replaced "may not" with "shall not".
*1.9 Section 9: removed rationale referring to the action of the GPL as Contaminat[ion].
* Section 10 added.
* Site History
 .:: Conformance to the OSD ::.

(This section is not part of the Open Source Definition.)

We think the Open Source Definition captures what the great majority of the software community originally meant, and still mean, by the term "Open Source". However, the term has become widely used and its meaning has lost some precision. The OSI Certified mark is OSI's way of certifying that the license under which the software is distributed conforms to the OSD; the generic term "Open Source" cannot provide that assurance, but we still encourage use of the term "Open Source" to mean conformance to the OSD. For information about the OSI Certified mark, and for a list of licenses that OSI has approved as conforming to the OSD, see the OSD Certification Mark page.

Resource Links and Sponsoring Organizations

The open-source campaign is supported by the following organizations:

  • Crynwr Software hosts our email.
  • Linux International was involved early; two board members helped define campaign that led to the formation of the Open Source Initiative.
  • Netscape Communications is officially cooperating with us in or effort to get "open source" (both term and concept) accepted in the industry.
  • O'Reilly Associates is likewise officially cooperating with us.

Other Links

  • The Free Software Foundation pioneered the concept of free software.
  • The Cathedral and the Bazaar, the research paper that persuaded Netscape to go open-source. (There are two sequels, Homesteading the Noosphere and The Magic Cauldron)
  • The Linux Documentation Project is a good way to learn about the most popular open-source operating system.
  • USENIX is the Advanced Computing Systems Association. Its international membership includes scientists, engineers, and system administrators working on the cutting edge of systems and software.
  • Michael Tiemann, CTO of RedHat speaking at the July 2001 O'Reilly Open Source Conference on the subject of 'shared-source' being deceiving. Our archived copy resides here.
  • 'Why Open Source Software / Free Software (OSS/FS)? Look at the Numbers!' by David Wheeler

Copyright © 2006 by the Open Source Initiative
Technical questions about the website go to Steve M.: webmaster at opensource.org / Policy questions about open source go to the Board of Directors.

The contents of this website are licensed under the Open Software License 2.1 or Academic Free License 2.1

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