I think that someone misunderstood the Xpdf licensing. While the information about GPL is correct, if you look here:
http://www.foolabs.com/xpdf/about.html
You will see that the author has given additional rights to developers.
Quoting from the author's own page:
Emphasis added by me.
Quote:
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.
If you're interested in commercial licensing, please see the Glyph & Cog web site.
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He says in no uncertain terms that you may redistribute xpdf in BINARY FORM and only asks that if you make USEFUL CHANGES TO XPDF that you send the author, not you Ashkulz, a copy of the code.
If someone wants to argue about pdflrfwin not having copies of the README, help files and COPYING files, then someone can simply zip them up with the .exe and be in full compliance.