使用用户密码的itext pdf解密

Question

In itext, can we decrypt a pdf file using the user password that was used to encrypt the file?

I know decryption can be done using owner password. What I want to achieve is:

In my web application, keep pdf files in encrypted form. When the authorized user requests for a pdf file, then depending on the permissions (user's role), I send them a file with appropriate permissions - ALLOW_PRINTING, ALLOW_COPY etc.

What I am doing right now is I encrypt a file using OWNER and USER passwords and then decrypt it using OWNER password but then that file allows all actions - print, copy etc.

Please help.

Thanks, Deepak

Answer 1

So far, I follow this page: http://www.cyberciti.biz/faq/removing-password-from-pdf-on-linux/

And the tool qpdf works with only user password. Hope this would help you.

Answer 2

For decryption, you can use PDFBox , see my answer here : https://stackoverflow.com/a/9976481/535203

I give a sample code to decrypt a PDF given its password.