Only the people behind the GPL (the dev & such) could ask a lawyer to resolve this copyright problem, maybe the people who have added something in the source lampshade is using (Ighalli for exemple in the CVS version, and only for the part he was involved in I think). Nobody else. You could tell the dev about this problem, but they are the one who choose.
So, without any dev asking lampshade to release his modified source, it's useless arguing...
And last... Sorry for my english

 
                         Smooth operator
                                                Smooth operator I hope Lamps doesn't end up getting banned
 I hope Lamps doesn't end up getting banned  
             
                         Banned
                                                Banned 
                         He Who Scars
                                                He Who Scars 
                             
                             kobold lord
                                                kobold lord Mage Prophet
                                                Mage Prophet