[...] RMS has claimed that failing to comply with the GPL meansthat your license is effectively terminated, even if you cease doing so.Even an accidental breach of the GPL could result in the copyright holder contending that you no longer have any license at all.
This is an important point. See Eben Moglen's writing in sections 36-38 of http://www.fsf.org/press/mysql-affidavit.html
-- MJR/slef My Opinion Only and not of any group I know http://www.ttllp.co.uk/ for creative copyleft computing