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Add encryption & protection flags support #92

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AndreRenaud opened this issue Jun 4, 2021 · 1 comment

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AndreRenaud commented Jun 4, 2021 •

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There is a reasonable description of this available at https://www.cs.cmu.edu/~dst/Adobe/Gallery/anon21jul01-pdf-encryption.txt and https://www.cs.cmu.edu/~dst/Adobe/Gallery/
Some further details are available at https://github.com/pdfcpu/pdfcpu

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AndreRenaud commented Jun 25, 2021

There is a sample encrypted file available from https://johnaugust.com/2014/try-to-open-this-pdf
And a discussion of opening/cracking it (including the code) at https://blog.didierstevens.com/2017/12/26/cracking-encrypted-pdfs-part-1/

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我无法使用密码"abc"打开output.pdf #106

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