From http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnpag2/html/pageula.asp:
That you have no right to combine or distribute the Software or modifications with other software or content that is licensed under terms that seek to require that the Software or modifications (or any intellectual property in it) be provided in source code form, licensed to others to allow the creation or distribution of derivative works, or distributed without charge.
The MS patterns and practices Enterprise Library is an awesome library. DAAB alone makes it worth using. The above clause is a load of shite. MS is marketing this library as open source. If you ask your average dot net junkie about open source, they will bitch and moan about how software is supposed to be sold, and it is their livelyhood and they have a wife and kids and all that. Then in the same breath, they will point to cases like this and say, “See, Microsoft does open source, when it makes sense.” What a load of malarchy. Microsoft is playing the role that the white man played to the natives of the Americas. We are your friend, see we aren’t bad, and then WHACK. No more open source.
So I’ve stopped using this stupid library wherever I can.