This is Debian GNU/Linux's prepackaged version of the 'xpdf' viewer written by Derek B. Noonburg. This package was original built by Dirk Eddelbuettel and since 1998 has been maintained by Hamish Moffatt . Current sources are found at http://www.foolabs.com/xpdf The upstream author's email address is: derekn@foolabs.com Copyright: 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 full text of the GPL can be found in /usr/share/common-licenses/GPL.