PdfCrypt is a windows 32 console/command line version PDF encrypt & decrypt software, supports standard 48 bits, 128 bits, AES-128 bits encryption, and decryption. And first of all,it is free.
Features : Remove restrictions on any secured PDF document (you should know the password). Any Acrobat version up to 9 is supported, even with 128-bit AES or 128-bit RC4 encryption. PDF restrictions removal is an instant process. Unlocked file can be opened in any PDF viewer without any restrictions so you may edit/copy/print it. Remove the PDF open password. Decryption of the file with password for opening for PDF files. Any Acrobat version up to 9 is supported, even with 128-bit AES or 128-bit RC4 encryption,but you must know the password first. You can also create restrictions on a PDF file.
PDF encrypt/decrypt
usage: pdfcrypt <input_file> <output_file> <operation> <arguments>
Where:
<operation> = encrypt
<owner_pw> <user_pw | ""> <permissions> <AES|128|40> [info pairs]
<operation> = decrypt
<owner_pw>
Permissions is 8 digit long 0 or 1. Each digit has a particular security function:
AllowPrinting
AllowModifyContents
AllowCopy
AllowModifyAnnotations
AllowFillIn (128 bit only)
AllowScreenReaders (128 bit only)
AllowAssembly (128 bit only)
AllowDegradedPrinting (128 bit only)
Example permissions to copy and print would be: 10100000
PDFcrypt is now obselete. See qPDF
If you do not have windows system, or do not want to download a software and learn how to use, feel free to use :
PDF Password Remover Online
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