Keep printed documents

hello

I have Print Server 2012 on the same server as AD 2012

I want to keep all documents that is printed in all printers attachet to this print server.

I checked and in directory C:\Windows\System32\spool\PRINTERS files are not in readable format.

If someone wants to print for example pdf file i want to keep this pdf file in print server.

Is it possible?

best regards
jan