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But doesn't client-side encryption already function at the OS level? For instance, the keys for FairPlay and the App Store have not been cracked, as far as I know.

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FairPlay has been cracked a lot of times, there have been many tools to remove the DRM from FairPlay encrypted songs/videos/books.

App store apps have also been cracked in that their keys have been stripped, on a jail broken phone you can run all those apps without needing a valid key.

FairPlay for video still hasn't been cracked (I wish it were). But I take your point.

FairPlay video was (kind of) cracked a few years ago I was in the habit of decrypting TV episodes using Requiem so I could watch them on my Linux netbook. You had to decrypt the files on a computer with iTunes installed though.

I don't know if Requiem has been keeping up with the latest iTunes releases.

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