[mbreese]

How is this surprising? If you use their service, you may need a license to a patent of theirs, which is granted to you for use of the service. The patent might not even be issued yet. It seems to me that they are just covering their bases.

So yes, you may need a patent, however, if you are using schema.org, you are not infringing on the patent (because they give you a limited license).

Then again, you might not be infringing on a patent too...