Does this apply to one particular file, or to DRM epub files in general?
(You almost certainly won't have the equivalent with free .epub files, for example from Project Gutenberg)
Most posts with a similar problem I have found on Google have gone unanswered, so I can't be very helpful I am afraid.
It looks as if it might be a problem that the vendor/distributor has not registered the book correctly with Adobe.
I guess your next step should be to query it with the vendor and see if they can help.