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https://issues.apache.org/jira/browse/PDFBOX-4839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17113057#comment-17113057
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Tilman Hausherr commented on PDFBOX-4839:
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I looked at the code: in the trunk and 2.*, when the owner password is empty,
the user password is taken as the owner password. The 1.8 version hasn't got
this, so I added it. However you should use the 2.0.* version, and use strong
encryption, i.e. not 40 bit, rather 256 bit encryption. IIRC this is the
default in 2.0.*.
> Iphone IOS able to open password PDF file without password
> ----------------------------------------------------------
>
> Key: PDFBOX-4839
> URL: https://issues.apache.org/jira/browse/PDFBOX-4839
> Project: PDFBox
> Issue Type: Bug
> Components: Crypto
> Affects Versions: 1.8.16
> Environment: Latest version of Apple IOS on Iphone 8s
> Reporter: Warren Nash
> Priority: Minor
> Labels: security
> Original Estimate: 4h
> Remaining Estimate: 4h
>
> Able to create encrypted password PDF file.
> # Able to use password PDF file on PC by entering password
> # Able to use password PDF file on Android Phone by entering password
> # Apply IOS open PDF file and then can see all contents of PDF file. No
> password is required.
>
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