I'd guess that would work. I know both DeDRM and DeACSM will export those .DER files and they look identical to me. The trouble is that since my DeACSM is already using a key, I can't see what the original, unauthorized options look like.
Looking at:
https://github.com/Leseratte10/acsm-calibre-plugin
I don't see anything that looks like it accepts the .DER file. And, that's odd since it will export one.
Also, on that page, there's the following:
Quote:
get_key_from_Adobe.py (included in the plugin's zip file) can be used to contact the Adobe server and download the DER key file for a given AdobeID to import into a DeDRM plugin. Just input your credentials and this script will output the DER file that can be used with DeDRM to decrypt books for this AdobeID. This works independantly from the account activation files or from this plugin, so it's a good way to get your AdobeID decryption key, especially if you're on Linux and it's too difficult to export the keys from ADE running inside Wine. This process does not use up one of your six device activations.
Though, generally it's recommended to use the Calibre plugin instead of these standalone scripts. Except for maybe the get_key_from_Adobe.py script if you want to remove DRM from existing eBooks without having to extract the key from ADE.
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So, there ought to be a way to import that .DER file.