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Add support for AES-256 encryption in PDF parsing

Add support for AES-256 encryption in PDF parsing: a task in harbor-swesmith-rl-artifacts: Harbor SWE-Smith 强化学习数据产物 (Harbor dataset). It seems there is an issue with handling AES-256 encrypted PDFs. When attempting to parse such files, the process does not complete successfully. This is…

The task

It seems there is an issue with handling AES-256 encrypted PDFs. When attempting to parse such files, the process does not complete successfully. This is particularly noticeable when using the `-P` option with AES-256 encrypted documents.

Part of keryszhan/harbor-swesmith-rl-artifacts.