DMCA Forces Cox To Censor Changelog?

Ross Vandegrift writes: "Alan Cox released 2.2.20pre10 today, which includes security fixes. He is refusing to indicate what security holes have been fixed, as Unix-style permissions could be used as an anti-circumvention device. The thread starts here. " It'd be great if people could read the threads here and try to figure out what is going on. I'm a little lost, but it looks like he's being overzealous.