The problem happens when combining Adobe Reader and FileOpen. You only need FileOpen if you have to read FileOpen protected documents, otherwise you can uninstall FileOpen and Adobe Reader should work fine. What worked for me is this: I contacted the document vendor (in my case, CIE) and complained in no uncertain words about their failure to provide the documents I bought for quite some money in a way that I can actually read them. I requested to get the documents in a non-FileOpen protected version, with e.g. watermark, labeled with my name and affiliation and date, in a pdf format that disallows editing with pdf standard compliant pdf editors like Adobe Acrobat, PDFXEdit and others. They were actually quite nice and provided this service. Maybe if many standard organizations are flooded with requests like this, they would just get rid of FileOpen protection and protect their documents with watermarks etc. Sorry, FileOpen guys.
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