You get the error that fulfilled by another User when the eBook are linked with a other Adobe ID.
Often its happens when you open/download a eBook before you authorize Digital Edition. Then
authorize and can the eBook no longer read.
OK ! thanks for your time and effort ! :-) Due to a lot of errosmessagers I did a lot of try-and-error, so how can I see with wich ID that book at this moment is linked ? Who can reset the link to that book to my propriot useracount ?
The linked Adobe ID can only reset of the Reseller of the eBook. You and Adobe has no access to the ebooks itself. If you not know which adobe ID are linked ask your reseller for help. If not can reset ask for a new download which can linked new with your Adobe ID. Before you Download the new file you should authorize Digital Edition with your Adobe ID.