“The current Microsoft Royalty-Free Sender ID Patent License Agreement terms are a barrier to any ASF project which wants to implement Sender ID” according to Apache and Apache further states that the current license is “incompatible with the Apache License 2.0”.
It looks like Microsoft is defining its own ‘open’ internet standard again and tries to take (financial) benefit of a global threat that it created itself by delivering poorly secured software.
Update: Today also Debian announced they cannot implement Sender ID technology as the Microsoft Royalty-Free License Agreement is a barrier to any Debian package which wants to implement Sender ID or include Sender ID support.