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I opened a PDF file in Adobe Acrobat 8.1 but this message popped up. The PDF file has no password. This is the first time I'm opening the PDF file using Acrobat 8.1.
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2 Replies 2/t5/acrobat-discussions/there-was-an-error-opening-this-document-can-t-decrypt-this-document/m-p/11860872#M300180 Feb 26, 2021 Feb 26, 2021
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That's very old. Can you open it in current Acrobat?
By the way, one cause of this is disk corruption, and another is ransonware attack.
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/t5/acrobat-discussions/there-was-an-error-opening-this-document-can-t-decrypt-this-document/m-p/11860874#M300181 Feb 26, 2021 Feb 26, 2021
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Oh, but careful. Installing Acrobat DC will uninstall Acrobat 8, and you will NEVER BE ABLE TO GET IT BACK.