The DRM from the Adobe Acrobat 6 + 7 (and the Readers) could differ from the ADE. If you have an Adobe ID (or a M$-Passport) you can deregister and should be able to convert it to ADE.
It's the best to call Adobe for further assistance.
By the way the decryption could be the same but Adobe 6 / 7 saves their keys in a file and not in the registry.
It's best to convert all your library to ADE .. there you have more support anyway.
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