This directory contains sample PDF files.

These files (including ones in nonfree/ subdirectory) can be
distributed freely but does not come with explicit licensing 
terms or source files.

Here are the credits of the original files:

simple1.pdf:
  (Originally taken from PDF Specification 1.7, 
  Appendix G. "Simple Text String Example" and modified)

simple2.pdf:
  (Originally taken from PDF Specification 1.7, 
  Appendix G. "Simple Graphics Example" and modified)

jo.pdf:
  Kenji Miyazawa (1896-1933, copyright expired)
  Preface of "Haru to Shura"
  (File generated from jo.tex by LaTeX and dvi2pdfm)

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nonfree/dmca.pdf: 
  U.S. Copyright Office
  The Digital Millenium Copyright Act
  http://www.copyright.gov/legislation/dmca.pdf

nonfree/f1040nr.pdf:
  U.S. Department of the Treasury Internal Revenue Service
  Form 1040-NR, U.S. Nonresident Alien Income Tax Return
  http://www.irs.gov/pub/irs-pdf/f1040nr.pdf

nonfree/i1040nr.pdf:
  U.S. Department of the Treasury Internal Revenue Service
  Instructions for Form 1040-NR, U.S. Nonresident Alien Income Tax Return
  http://www.irs.gov/pub/irs-pdf/i1040nr.pdf

nonfree/kampo.pdf:
  National Priting Bureau of Japan
  Official Gazette, Vol. 4817
  http://kanpou.npb.go.jp/

nonfree/nlp2004slides.pdf:
  Yusuke Shinyama and Satoshi Sekine
  "Named Entity Discovery from Comparable News Corpora"

nonfree/naacl06-shinyama.pdf:
  Yusuke Shinyama and Satoshi Sekine
  "Preemptive Information Extraction using Unrestircted Relation Discovery"

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Files in the encryption folder have been generated with cpdf 1.7 [http://www.coherentpdf.com/]
from the base.pdf file generated with LibreOffice 4.1.1.2 as follows:

cpdf -encrypt 40bit foo baz base.pdf -o rc4-40.pdf
cpdf -encrypt 128bit foo baz base.pdf -o rc4-128.pdf
cpdf -encrypt AES foo baz base.pdf -o aes-128.pdf
cpdf -encrypt AES foo baz base.pdf -no-encrypt-metadata -o aes-128-m.pdf
cpdf -encrypt AES256 foo baz base.pdf -o aes-256.pdf
cpdf -encrypt AES256 foo baz base.pdf -no-encrypt-metadata -o aes-256-m.pdf