From: [redacted]
To: dst@cs.cmu.edu
Subject: Xpdf patch for Copy/Print protection
Date: Wed, 7 Aug 2002

English is not my native language so...

Based on xpdf 0.93 patch found on http://www-2.cs.cmu.edu/~dst/Adobe/Gallery/  
it seems that can be a similar solution for Printing protection of PDF 
documents.

Just comment the folowing lines in source - pdftops.cc :

 // check for print permission
 if (!doc->okToPrint()) {
   error(-1, "Printing this document is not allowed.");
   goto err1;
 }

In xdf.cc eliminate the test for printing:

 if (doc->okToPrint() ) {
      psOut = new PSOutputDev(psFileName->getCString(), doc->getXRef(),
                              doc->getCatalog(), psFirstPage, psLastPage,
                              psModePS);
in this or any other mode:
if ((doc->okToPrint()) or (!doc->okToPrint()) ) {
      psOut = new PSOutputDev(psFileName->getCString(), doc->getXRef(),
                              doc->getCatalog(), psFirstPage, psLastPage,
                              psModePS);