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https://issues.apache.org/jira/browse/PDFBOX-1594?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15154714#comment-15154714
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Tilman Hausherr commented on PDFBOX-1594:
-----------------------------------------

See java operator precedence here: 
https://docs.oracle.com/javase/tutorial/java/nutsandbolts/operators.html

IMHO it is better to use "too many" parentheses than to try to properly 
remember these.

> Add support for AES256 Encryption 
> ----------------------------------
>
>                 Key: PDFBOX-1594
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-1594
>             Project: PDFBox
>          Issue Type: Improvement
>          Components: Crypto
>            Reporter: Maruan Sahyoun
>            Assignee: John Hewson
>              Labels: AES256
>             Fix For: 2.0.0
>
>         Attachments: fix-pdfbox-2.0.0-encrypt.diff, pdfbox-1.8.4-aes256.diff, 
> pdfbox-2.0.0-r1580297-aes256.diff
>
>
> Adobe 9 added support for AES 256 encryption. Further information is 
> available at  
> http://www.adobe.com/content/dam/Adobe/en/devnet/acrobat/pdfs/adobe_supplement_iso32000.pdf
>  (specially 3.5.1) or ISO 32000-2.



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