E_ADEPT_DOCUMENT_TYPE_UNKNOWN: ... what is the problem? and yes, I tried to open a PDF ...

Fehler beim Abrufen der Lizenz. Lizenzserver-Kommunikationsfehler:
E_ADEPT_DOCUMENT_TYPE_UNKNOWN:
Bücher der Uni-Bib ... ich kann Sie downloaden, aber nicht öffnen ... wenn ich sie online lesen will, hab ich nur ein schwarzes Blatt Papier?
HELP ... was ist passiert? Vor ein paar Tagen ging es schonmal!!???!!!

It sounds like your problem is related to eBooks. Adobe Reader for iOS does not support eBooks or other types of DRM (Digital Rights Management) protected PDF documents.
Please see E_ADEPT_DOCUMENT_TYPE_UNKNOWN error from ADE or other readers.
Adobe Digital Editions (ADE) supports eBooks on desktop (Mac or Windows) computers. Currently, ADE has no mobile apps (iOS, Android).

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And the answer is:
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E_ADEPT_DOCUMENT_TYPE_UNKNOWN: ... what is the problem? and yes, I tried to open a PDF ...

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