The probable issue is that your library is sending you .acsm files that require your Adobe ID to download the file. Basically, the .acsm file from the library gets send to ADE. ADE then generates a request signed with the key generated when ADE was registered to your Adobe ID. Once you opened the book with your Adobe ID, anonymous or any other Adobe ID will not work. I would suggest using the same Adobe ID for DeACSM as you are using for ADE.
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