I'm also seeing this problem. I'd previously used ineptpdf to decrypt a purchased copy of Anathem and it worked well, so I went ahead and bought a McGraw-Hill textbook. Of course it can't be decrypted, but I can still use it in ADE. From what I can tell, v5 and v6 are only "feature enhancement" releases and do not contain any bugfixes. Too bad ILC is MIA.
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