PDF encryption limitation and operating limits, such as can't browse, can't print, can't copy, need to enter a password, what do you want to be a software, enter the password later can lift the restrictions, who can tell me about the specific principles and design steps, main is I don't know online remove those online tools what is the principle of, on the desktop, enter the password each time you can open, enter the password again you can print, but after you close the file to open, still need to enter the password, it's not lifted,

CodePudding user response:

Can you give me a open but can't print the PDF try...

Vertical and horizontal IT for so many years I have not seen this PDF...

CodePudding user response:

Modify the PDF to regenerate a bai

CodePudding user response:

https://github.com/qpdf/qpdf

Use https://www.jianshu.com/p/fd1117b88b43

Open source, support PDF decrypt, at the same time provide command line calls