Comment by asveikau

I thought I remember reading on an FAQ a long time ago that they don't mind such contributions. Can't find it now. Could be wrong.

I myself am ex msft so that's why I was curious. I have not contributed to any of these though.

Edit: found it.

https://web.archive.org/web/20110707221707/http://www.reacto...

Section on tainted developers says: "Tainted Developers". There is a legal theory that is occasionally cited in the context of producing a work-alike implementation of a published copyrighted work. ... It is the position of the Project that this theory is invalid for a number of reasons. As a general rule, there is no reason that a developer who has seen non-free code cannot write logically similar code for ReactOS. Then talks about disclosure of NDAs.

I read that as: if you worked at MS, disclose your NDA, but it doesn't automatically forbid your contribution.