As pdurrant has pointed out, secret keys must be kept secret. If you have a closed group of trusted users, you can have open source DRM. If every reading device has the key somewhere on it, somebody will find it. All DVD drives have those secret keys, so somebody took one apart and read out the memory chips. Same thing could be done on a reader; but why bother when there is a Windows app with the key buried in it on my computer?
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