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=== Linux PDF Tools: pdfcrack ===To unlock a password protected PDF file when you do NOT know the password. PDFCrack is a GNU/Linux tool for recovering passwords and content from PDF-files. It is small, command line driven without external dependencies. pdfcrack -f 2020CrackMe.pdfIf you see the error The specific version is not supported (Standard - 6)Then the version of pdfcrack does not support 256-bit