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I can't see much about this error on the web:
one comment is at http://www.topreviewshop.com/nextbook_next2_tablet_e_reader_conclusion
Just a thought, ADE and some ereader devices/apps do not like passwords that include special characters.
If you have anything other than non-accented letters and numbers in your password,
log in at the Adobe website and change the password to a weaker one.
Then try again to activate.
my password is very easy without the items named by you. I dont think that this is the conclusion but thanks for your help
Most Adobe DRM books use your Adobe ID for authorization, but some use vendor IDs.
Usually you get a reasonably sensible message out of ADE if you need a vendor ID, but maybe not always.
You could check with the vendor if you need a special ID.
For example I just read that for B&N books:
ADE 2.0 finally added support for the B&N DRM.
The unlock code are the credit card number and name of the default credit card of your B&N account.
It still doesn't work with change of password.
It's a brand new Pocket Book Touch Lux 3