The Open Software License ("OSL") is a software licence created by Lawrence Rosen; the Open Source Initiative (OSI) has certified it as an open source license.
The OSL is, in the main, a fairly standard copyleft license. It's main peculiarity (and the reason it was written) is its patent termination clause:
- 10) Mutual Termination for Patent Action. This License shall terminate automatically and You may no longer exercise any of the rights granted to You by this License if You file a lawsuit in any court alleging that any OSI Certified open source software that is licensed under any license containing this "Mutual Termination for Patent Action" clause infringes any patent claims that are essential to use that software.
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