FillPDF should support the encrypt_*, allow, owner_pw, and user_pw operations in PDFtk. Documentation is at https://www.pdflabs.com/docs/pdftk-man-page/#dest-op-attach
This feature is being sponsored by noahzenzen (thanks!)
I'm done with it. Creating issue to get a number, then attaching a patch.
Closed: outdated
1.0
Code
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This is the contents of the branch 2948793-pdftk-security which branched-off from 7.x-1.14.