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When setting Access permissions in a PDF, I need to specify an owner password, but do I need to also specify the encryption level, or is that needed only for a user password?
I’m reading the PDF specification (pdf_reference_1-7.pdf) about security handlers, but it’s not a very easy read so I’d rather ask.
Access permissions can be set only when the document is encrypted. It does not matter whether you set or not the owner and/or user password, you have to set all the encryption related properties, algorithm, key size, version, revision, etc.