Open Source Initiative

The Open Source Definition spells out the essential qualities of Open Source software. Since the community needs a reliable way to determine whether a piece of software really is open source, OSI is registering the Open Source Initiative Approved License trademark, and making it available for use with qualifying software projects.

This trademark may be used to identify licenses that are "current" OSI Approved License. A current approved license is both:

• On the list of approved Open Source licenses.
• NOT categorized as either "superseded" or "voluntarily retired".

Using the Mark

To be eligible to use the mark, you must:

• Only use the term "Open Source" to refer to software distributed under an OSI Approved License.
• Only use the OSI Approved License mark on a page -- or clearly defined sub-page -- that only contains software distributed under a current OSI Approved License.

If you have any questions, please contact the OSI Webmaster