cc-sharp is a C# library for verifying Creative Commons license metadata. A Google Code project has been set up here.
cc-sharp is available on the Creative Commons Source Forge Subversion repository for browsing. You can also use Subversion to check the code out and build it yourself:
svn checkout http://cc-sharp.googlecode.com/svn/trunk/ cc-sharp
The project was built as a MonoDevelop solution so to build it from home, you must have MonoDevelop.