pdf creator Adobe Acrobat 8.1 Combine Files 4 pdf encrypted yes (print:yes copy:no change:no addNotes:no) 4 pdf files total 4 pdf optimized yes 4 pdf pages avg 128 pdf pages max 187 pdf pages min 79 pdf pages total 513 pdf size avg 8265358 pdf size max 9945207 pdf size min 7180182 pdf size total 33061430 pdf version 1.6 4