The Microsoft Open Specification Promise (or OSP), is a promise by Microsoft, published in September 2006, to not assert legal rights over certain Microsoft patents on implementations of an included list of technologies.
The OSP is a Covenant Not to Sue and an example of Fair, Reasonable and Non Discriminatory terms for the patents in question.
The OSP licensing covers any use and any implementations of an appended list of covered specifications. It is limited for implementations to the extent that they conform to those specifications. This allows for conformance to be partial and does not require the conformance to be perfect.
Read more about Microsoft Open Specification Promise: Compatibility With Open Source Licensing
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