http://www.dslreports.com/shownews/107309
File names aren't how files are identified, they're identified through things like MD5 hashes on the component parts. Monitoring systems don't assume just because a file is named something provocative it's that file they only care if the blocks of the file match those it knows are dubious or there are other ways to forensically track.
Thinks have progressed a bit since assuming some totally random length and content file calle avatar.avi would be an Avatar rip-off. Basic DPI would show it lacks the right structure to be a video file and encrypting it would put it into the 'unknown' basket unless other forensic analysis confirms it is what it says it is
