MSFT's license for Sender-ID

For those of you who are unaware, some time ago Microsoft and SPF-proponent Meng Wong agreed to merge SPF and Caller-ID into Sender-ID. The license for Sender-ID has just been released, and it looks like it will likely stifle the adoption of Sender-ID. A cursory looks shows that “This patent license is incompatible with the Open Source Definition, the Free Software Definition, the Debian Free Software Guidelines, and the GPL and LGPL licenses specifically”. It also appears that, to use the license, a signed agreement with MSFT is required. Looks like embrace and extend strikes again. While SPF did have it's problems, it was a step in the right direction. We'll have to see how this one plays out.
–jeremy