Reading encrypted pdf files in ubuntu

In ubuntu, read the encrypted pdf-general Linux technology-Linux technology and application information. The following is a detailed description. The tutorials downloaded by several programmers are encrypted and cannot be seen in ubuntu. You need to enter a password and do not know what the password is.

However, in linux, It is very straightforward to directly crack this pdf file and then read it again.

Program: javascrack

Installation command:

Sudo aptitude install javascrack

You can directly use the command: javascrack **/javasfilename=] # No options are added.

You can query the specific format and usage.