my primary question is already solved, I could change the authorization of DE. Now I've got a minor question left:
Is there a chance to change the registration-Info (i.e.: the ID used when downloading an ebook) of downloaded ebooks? Is there a general way to modify it on stored ebooks? Is it depending on the provider of an ebook? What chances do I have?
Thanks in advance,
In a word: no.
Changing the user ID associated with a downloaded ebook would violate
copyright laws. Your best chance to get those ebooks in readable state is
to go back to the source and ask them to download the ebooks again under
your new ID. You'll have to tell them the story.