是否可以检查PDF是否使用ghostscript进行密码保护? [英] is it possible to check if pdf is password protected using ghostscript?

问题描述

是否可以检查PDF是否已使用ghostscript进行密码保护? 命令是什么? 我知道您可以使用ghostscript剥离pdf密码， 但是我要做的只是检查PDF是否受密码保护或启用了安全性.

is it possible to check if pdf is password protected using ghostscript? what would be the command? I know you can strip pdf password using ghostscript, but all I want to do is just checking if PDF is password protected or security enabled.

推荐答案

checkuserpasswdPDF.sh:

#!/bin/sh

GS=~/gs/bin/gs
output=`$GS -dBATCH -sNODISPLAY "$1" 2>&1`
gsexit=$?

if [ "$gsexit" == "0" ]; then
  echo "Not user-password protected"
  exit 0;
else
  found=`echo "$output" |grep -o "This file requires a password"`
  if [ -z "$found" ]; then
    echo "Failed to invoke gs" 
    exit $gsexit
  else
    echo "Protected"
    exit 0;
  fi  
fi

检查受用户密码保护的PDF:.

Checks for user-password protected PDFs: checkuserpasswdPDF.sh test.pdf.

GS忽略了所有者密码(请参阅这个).

GS disregards owner-passwords (see this).

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