Eric White's Blog
Open XML, SharePoint, and Office
Notes about the Microsoft Public License (Ms-PL)
I’ve had a few questions lately about how the Microsoft Public License works.
The text of the Ms-PL: http://www.microsoft.com/opensource/licenses.mspx
You can find a page on Microsoft.com that explains the Ms-PL in straightforward terms: http://www.microsoft.com/resources/sharedsource/communitysourcelicensing.mspx
Here is a StackOverflow.com question/answer page regarding the Ms-PL: http://stackoverflow.com/questions/1424307/how-does-ms-pl-license-work