Unless you stripped the DRM from the files, yes, they are encrypted. At least according to the Wikipedia page on FairPlay [http://en.wikipedia.org/wiki/FairPlay

Unless you stripped the DRM from the files, yes, they are encrypted. At least according to the Wikipedia page on FairPlay [http://en.wikipedia.org/wiki/FairPlay http://en.wikipedia.org/wiki/FairPlay], all the iTunes files are encrypted. Also, wouldn't proving it doesn't work by setting up a deliberately flawed scenario amount to a bit of blogsturbation? Should I write an article about "finding out whether my computer will turn on even if it's unplugged"? Answer: no. But read my article about me TRYING it just to be sure. I think you should write a follow-up article where you splice together raw video files and include a similar segment in all the different files. Then, put that through the dedup test. I would actually be interested to see the ability of ZFS implementations to find worthwhile anchor points within files and do smart byte-level deduplication.