This patch modifies xpdf (www.foolabs.com/xpdf) to optionally ignore Adobe
Acrobat copy protection, allowing protected documents to be annotated and
printed. Most of the patch is modifications to the configure script; the
changes are all in one file, and very small indeed.

To apply the patch:

  tar -xzf xpdf.tar-gz
  cp anti.diff xpdf/
  cd xpdf
  patch < anti.diff