Set password on PDF file

Hi H,

Here's a five-minute EE video Micro Tutorial that shows how to do it:

How to password-protect a PDF with free software - PDF-XChange Editor

Regards, Joe

Thank you Joe,  but I need dinamicaly create password through Delphi.
Is it possible?

Thank you, H

Ah, sorry, missed your Delphi Topic. When I need to do it programmatically, I call a command line utility, which you can do easily with Delphi. I have a developer's license for the one that I use (expensive), but a good free one is PDFtk Server:
http://www.pdflabs.com/tools/pdftk-server/

I used that for many years before switching to the non-free one. Don't be misled by "Server" in the name. I don't know why they called it that, but it's just an executable (pdftk.exe, with a supporting DLL, libiconv2.dll) that runs on "standard" Windows — it does not have to run on a "server" Windows.

The full syntax for the PDFtk Server command line and some usage examples are here:
http://www.pdflabs.com/docs/pdftk-man-page/
http://www.pdflabs.com/docs/pdftk-cli-examples/

The two password options are:
[ owner_pw <owner password | PROMPT> ]
[ user_pw <user password | PROMPT> ]

As a disclaimer, I want to emphasize that I have no affiliation with this company and no financial interest in it whatsoever. I am simply a happy user/customer. Regards, Joe

the above will help. that said pdf encryption is rather easy to break, so you might consider other ways such as sticking the pdf file in an encrypted archive. 7zip features lzma encryption

Hi H,
skullnobrains makes a good point, and note that 7-Zip also comes in a command line version that you can call from your Delphi code...actually, there are two versions...7za.exe, which supports only 7z, xz, lzma, cab, zip, gzip, bzip2, and tar formats...and 7z.exe, which supports several other formats, but requires the 7z.dll module (that's the advantage of 7za.exe...it is a stand-alone executable that doesn't require any external modules). Regards, Joe

licensed does not mean $$. think of creative common, apache, bsd, SPL... even gnu is usually free, though it does come with a bunch of restrictions.