wxPython Licence vs GPL

[Andrew Koenig]

"John Perks and Sarah Mount" <johnandsarah at estragon.freeserve.co.uk> wrote 
in message news:dlvmtu$fp9$1 at newsg4.svr.pol.co.uk...
> we have some Python code we're planning to GPL. However, bits of it were

> (This assumes the wxPython Licence is compatible with the GPL -- if not,
> do we just cosmetically change any remaining lines, so none remain from
> the orignal?)

What makes you think that cosmetic changes in a copyrighted work affect the 
copyright?