Two suggestions: either/both/neither may work. Good luck.
ADE 2.0 is very good at getting registrations corrupt.
Try removing all registrations; crtl-shift-D to ADE (cmd-shift-D on Mac). Respond to prompts.
Try again to register with the original ID.
There are lots of bugs in ADE2.0. Try replacing ADE2.0 with the older but more reliable v1.7.2.
Version 1.7.2, it is a little difficult to find, available on Adobe site for Windows and for Mac.
The forum software is sometimes corrupting the link above. There shouldn't be a blank in 'editio ns.html'. The following redirects to the same page: http://tinyurl.com/diged172
Brilliant. Thanks very much sjpt that's what I was looking for. Removed and re-authorised and now it is OK again.
also fixed error "License key is damaged" when accessing a file that previously worked.
yes - moving to an older version 1.7.2 fixed the issue.
brutal - going backwards from adobe 4 to 1.7.2 resolves the issue ... thanks to comments in the forum the issue is resolved and no thanks to adobe
I've been trying to sort this problem out but the links above to ADE v1.7.2 didn't work, and nor did lots of others. Finally found one at Adobe Digital Editions Download that worked. Downloaded it, sorted the problem and it only took a few minutes - Shame it took me about 3 hours of going nuts to find this site!