License compatibility of MS-PL and MS-CL (Was: (RE: Groklaw's OSI item (was: When will CPAL actually be _used_?))

Chris Travers chris.travers at
Sat Aug 25 01:33:29 UTC 2007

Thanks Jim.  This is very needed.  One comment below.

On 8/24/07, Thatcher, Jim E. (Woodcock Washburn) <jthatcher at>
> *
> Q6. What about the GPL? Can I use Ms-PL-licensed code in a GPL project?
> *
> A. You should consult your own attorney to answer that question for you.
> I'm happy to explain what I and Microsoft understand the Ms-PL to mean, but
> you shouldn't rely on my interpretation of other licenses without validating
> that interpretation with your own attorney. The way I read the GPL you may
> be able to use Ms-PL-licensed code *in conjunction with *GPL-licensed code
> as long as the Ms-PL-licensed code (1) is contained in "identifiable
> sections … not derived from the [GPL-licensed] Program", (2) "can be
> reasonably considered independent and separate works in themselves" and (3),
> " you distribute them as separate works".

That seems to be effective for a GPL v2 application as well. Thanks.

Best Wishes,
Chris Travers
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