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https://issues.apache.org/jira/browse/PDFBOX-5866?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17872679#comment-17872679
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Michael Klink commented on PDFBOX-5866:
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Great!
I see you only covered revisions {{<= 4}} and {{== 6}}. Does PDFBox support
revision {{== 5}}, the algorithm from an Adobe developer extension to ISO
32000-1? Then you could also find an expected length for that case.
> Unable to load password protected pdf
> --------------------------------------
>
> Key: PDFBOX-5866
> URL: https://issues.apache.org/jira/browse/PDFBOX-5866
> Project: PDFBox
> Issue Type: Bug
> Components: Crypto
> Affects Versions: 2.0.32, 3.0.3 PDFBox
> Reporter: Charles D
> Assignee: Tilman Hausherr
> Priority: Major
> Fix For: 2.0.33, 3.0.4 PDFBox, 4.0.0
>
> Attachments: pdfbox_invalid_pwd.pdf
>
>
> PDFBox is unable to load password protected pdf. Error is "Invalid AES key
> length: 48 bytes."
> Adobe and qpdf are able to successfully open it , but many other applications
> I've tried are unable to do so.
> The pdf is created by a third party scanner so unfortunately we have no
> insight/control over its creation.
> [^pdfbox_invalid_pwd.pdf] . Please let me know the best way to provide the
> password.
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