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Originally Posted by davidfor
Firstly, the DRM mechanisms for ePub and PDF is completely different from and unrelated to the DRM mechanism for kepubs. For ePub and PDF, the Adobe RMSDK is used. And is used for ePubs and PDF with and without DRM. So a failure on one doesn't mean a failure for the other.
The DRM error is something that has been around a while. It isn't obvious what is happening. And rebooting the device usually solves it. That suggests it could be a problem with one of the processes used for reading. It could be that a process has hung, or has crashed and not restarted properly. Restarting the device clears those problems as everything gets started anew.
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That was informative. Thank you.