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Speaking of DRM--I've encountered an odd situation with a few pdfs (legit freebies from Copia). Though I've supposedly decrypted them, they still will not open outside of the Adobe Reader. Calibre indicates that they're still locked. I never get any kind of error message telling me they can't be decrypted--but the end result is that they're still apparently locked, and I've tried decrypting multiple times.
I'm not asking for help in decrypting them--I know that's verboten, and it's just not that important anyway--but I'm just baffled about why these three particular books would remain locked. Any insights?
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