Sanctum Inc. issued US patent number 6,584,569 B2 in 2003. The patent is entitled “A system for determining web application security vulnerabilities” In my non-lawyer opinion, this means nothing. Thousands of patents are issued each year, just waiting to be knocked down in court. Still, it reminds me how Marcus Ranum thanked Dorothy Denning for writing about intrusion detection in the 1980s, clearly establishing these prior art arguments and paving the way for commercial IDS products.”]
Source: https://taosecurity.blogspot.com/2003/08/i-missed-this-on-open-web-application.html