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https://issues.apache.org/jira/browse/PDFBOX-4436?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16787197#comment-16787197
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Tilman Hausherr commented on PDFBOX-4436:
-----------------------------------------
"Unlike strings within the body of the document, those in the encryption
dictionary must be direct objects"
This is only about the strings, these were never indirect.
So I committed the changes and more. I also made another object direct that is
related to certificate encryption.
One thing still doesn't work, that is an AES256 file on Microsoft Edge, but
they are abandoning their browser anyway.
> Error opening encrypted PDF in Acrobat IOS/Android
> --------------------------------------------------
>
> Key: PDFBOX-4436
> URL: https://issues.apache.org/jira/browse/PDFBOX-4436
> Project: PDFBox
> Issue Type: Bug
> Components: Crypto
> Affects Versions: 2.0.13
> Environment: Linux, OSX
> Reporter: Klaus Mueller
> Priority: Major
> Fix For: 2.0.15
>
> Attachments: itext-AES256-encrypted.pdf, mobile.patch, plain.pdf,
> test.pdf, testenc.pdf, working_android.pdf
>
>
> When encrypting a PDF document using command line, the encrypted PDF is not
> useable in Acrobat Reader IOS or Android.
> Command Line:
> {{java -jar pdfbox-app-2.0.13.jar Encrypt -O test -U test -keyLength 256
> -canAssemble false -canExtractContent false -canModify false
> -canModifyAnnotations false plain.pdf testenc.pdf }}
> Other viewers like Foxit work.
> Java Version:
> {{java version "1.8.0_201"}}
> {{Java(TM) SE Runtime Environment (build 1.8.0_201-b09)}}
> {{Java HotSpot(TM) 64-Bit Server VM (build 25.201-b09, mixed mode)}}
> Tried encryption under Linux and OSX.
>
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