The open patent movement seeks to build a portfolio of patented inventions that can freely be distributed under a copyleft-like license.[1] These works could be used as is, or improved, in which case the patent improvement would have to be re-licensed to the institution that holds the original patent, and from which the original work was licensed. This frees all users who have accepted the license from the threat of lawsuits for patent infringement, in exchange for their surrendering the right to build up new patents of their own (in the specific domain for which the original license applies).[citation needed]
The open patent idea is designed to be practiced by consortia of research-oriented companies[2] and increasingly by standards bodies. These also commonly use open trademark methods to ensure some compliance with a suite of compatibility tests, e.g. Java, X/Open both of which forbid use of the mark by the non-compliant.[citation needed]
Critics[specify] question whether the promoters of truly 'open' and mandatory improvement licensing, having spent most of their lives opposed to software patents, can actually attract donors of patents, or would actually participate in a process that they claim to despise. This criticism probably focuses unduly on the personality and ideology of Richard Stallman, who has nonetheless sought to solicit donors for such schemes.
On October 12, 2001 the Free Software Foundation and Finite State Machine Labs Inc. (FSMLabs) announced a GPL - compliant open-patent license for FSMLabs' software patent, US 5995745. Titled the Open RTLinux patent license Version 2, it provides for usage of this patent in accordance with the GPL.[3]
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