I cannot open acsm by Adobe Digital Edition.

[sarahlisl]

I cannot open acsm by Adobe Digital Edition. It always says the file cannot be opened (in german). If it's an epub-file it's no problem to read the book but if the file must be converted it can't be opened. Can someone help me with this question?

[sarahlisl]

If i want to open the file it says "Error no activation" and i found out it's not possible to delete my authorization. Some one knows a solution?