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# Introduction
This is a modified copy of the original Xpdf program. To avoid confusion
with the original program, this modified, improved copy is called
xpdf-poppler.
The original author of Xpdf was Derek B. Noonburg <[email protected]> and
you can see the copyright that he claimed in the section below.
This modified On the other hand, xpdf-poppler is maintained it is now
maintained by Rogério Theodoro de Brito <[email protected]>, with assistance
from a large number of knowledgeable contributors.
# Copyright
## The original copyright notice
Xpdf is copyright 1996-2007 Derek B. Noonburg.
Xpdf is licensed under the GNU General Public License (GPL), version
2. In my opinion, the GPL is a convoluted, confusing, ambiguous mess.
But it's also pervasive, and I'm sick of arguing. And even if it is
confusing, the basic idea is good.
In order to cut down on the confusion a little bit, here are some
informal clarifications:
- I don't mind if you redistribute xpdf in source and/or binary form,
as long as you include all of the documentation: README, man pages
(or help files), and COPYING. (Note that the README file contains a
pointer to a web page with the source code.)
- Selling a CD-ROM that contains xpdf is fine with me, as long as it
includes the documentation. I wouldn't mind receiving a sample
copy, but it's not necessary.
- If you make useful changes to xpdf, please make the source code
available -- post it on a web site, email it to me, whatever.
For information on commercial licensing and consulting, please see the
Glyph & Cog web site:
http://www.glyphandcog.com/
## The copyright notice of xpdf-poppler
Changes to the work performed by Rogério Brito are:
Copyright © 2010, 2011 Rogério Theodoro de Brito
and are licensed under the GPL version 2 (for compatibility with the
existing code) or latter versions.
If you have submitted a change to this work and you wish to claim copyright,
then you can simply file an issue at:
https://github.com/rbrito/xpdf-poppler/issues