The application author claims that, among the others, a "DocuManager" application bundled its software and sold it with 1) disclosing that the original software is his "Mayan EDMS" 2) abiding to the licence (GPLv2).
Google tells us that there are two DocuManager applications:
1) http://www.evolusoft.com/documanager.html
Point 1: Mayan EDMS is not properly credited.
A search for "mayan site:X" did not find anything in any of these sites. The author seems right.
Point 2: GPL terms not respected.
One of the GPL terms deals with the fact that you must distribute the licence text itself or offer a way to do so. The string GPL must, thus, appear somewhere in the site.
The query in this case is "GPL site:X". Site 1 and 3 have no page with the term GPL inside. Site 2 instead seems to talk about a GPL version and a commercial, extended, closed version: http://translate.google.com/translate?sl=auto&tl=en&...
As is for point 1, author is right about point 2 for all these three applications.
We do not know which software the author of Mayam EDMS was referring to when he wrote "DocuManager", but, in any case, none of the three surveyed applications seems to fulfil the licence terms.