( April 9, 2026, 10:35 AM EDT) -- WASHINGTON, D.C. — The U.S. Patent Trial and Appeal Board (PTAB) did not improperly conclude that a user guide for a web security system is a publicly accessible prior art reference, a Federal Circuit U.S. Court of Appeals panel held; the panel also affirmed the PTAB’s finding that the user guide thus anticipates all claims of a patent describing a decryption system....