1. pdftest.pdf:
A small pdf file picked up from internet.  It contains text:
E:\M55\!\1725.fm 2003-01-01 18:15 P Tagg, IPM, University of Liverpool
A VERY SMALL PDF FILE
A VERY SMALL PDF FILE
A VERY SMALL PDF FILE
A VERY SMALL PDF FILE
A VERY SMALL PDF FILE
A VERY SMALL PDF FILE

2. encrypt.pdf:
The same file as above, encrypted with owner's password 'owner'
and empty user's password.