The license of Microsoft's Portable Class Libraries

Direct link (RTF): http://go.microsoft.com/fwlink/?LinkID=313707

Some gems in there:

BACKUP COPY. You may make one backup copy of the software. You may use it only to reinstall the software.

DOCUMENTATION. Any person that has valid access to your computer or internal network may copy and use the documentation for your internal, reference purposes.

You may not: ... distribute Distributable Code to run on a platform other than the Windows platform;