PDF Encryption

[Soji 1]

I have a requirement to encrypt a PDF file with password.

Does anyone have experience doing this with any libraries? (I am looking for a free library at this moment.)

Edited April 5, 2019 by Soji

[stijnsanders 35]

You should check if synpdf can do it: https://github.com/synopse/SynPDF

[Soji 1]

Just now, stijnsanders said:

You should check if synpdf can do it: https://github.com/synopse/SynPDF

I already downloaded that tried. But it seems like it can only generate the PDF. I haven't find anyway to load an existing PDF file and just encrypt it.

I looked into the help/source and it looks like it is not possible to load an existing PDF file and make changes with that unit.

[HolgerX 7]

Hmm..

 

Take a look to ghostscript:

https://stackoverflow.com/questions/12921006/password-protected-pdf-using-ghostscript/12929181

[David Heffernan 2345]

I don't think that this is encryption. And in any case, it's probably worth knowing that the password can be removed trivially. 

[Guest]

There are several prjects/tools out there for that, mostly pricey stuff built on other stuff. Also check with TJoe when it comes to PDF handling.

[Fritzew 51]

2 hours ago, Dany Marmur said:

There are several prjects/tools out there for that, mostly pricey stuff built on other stuff. Also check with TJoe when it comes to PDF handling.

I Would also tend to @tjoe if it comes to Pdf Questions. I don't think you will find a more competent person if it comes to Delphi and PDF 
https://uberpdf.org