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.