I have ricently purchased a new ebook. While downloading the ACSM file I'm getting a message on my reader (Pocketbook 602 pro) that the "file is damaged or protected", but I did get a EPUB file that doesn't open.
The strange thing is that after this happened, I'm also unable to open a PDF file of a book I'm currently reading, and opened many times. I'm suddenly asked to enter a password, but I don't know password of what!? My password for Adobe doesn't work.
Most likely, a setting on your ereader is causing the issues. Check the
User's Guide for the Pocketbook and see how it treats DRM-protected files.
Also, have you linked to their website recently for any software updates?
In fact Yes, I updated the software recently and I'm afraid that problems started after that
This may be restating the obvious, but it would appear logically that the
software update may have caused your problem.... I can't help you with