writes "According to the article on Ars Technica, Microsoft, Symantec and 20 other companies are being sued over patents covering "systems for governing application and data permissions, as well as ensuring application integrity". The patents were granted in the 90's to the Information Protection and Authentication of Texas (IPAT).
From the article:
A response from any of the defendants is still forthcoming, and it is unclear whether the authentication and permissions systems that IPAT's patent describes are precluded by prior art. Even if IPAT has a leg to stand on in court, however, it certainly didn't take the easy route to recovering any damages by suing 22 companies.