Now what such permissions mean once you tack on the GPL or a proprietary license, I'm not sure. As far as I can tell, they would be pretty hollow.
The LGPL does not grant the right of re-licence LGPL components. However, as a license it does not prohibit sublicensing - nor can it, as the primary license is that of the main program a LGPL component is used in.
Remember that the LGPL was written for libraries, to allow code which is fundementally GPL to be linked to propritery licenses.
In the definition of sublicencing, technically from a legal point even transgaming are not allowed to newt the fundemental sublicencing right of the Wine code (as they do, in the AFPL). They can remove the sublicencing right on their own code, however, as that belongs under different copyright.
This is all conjecture, of course, and I deny being any kind of legal expert, only someone who has been involved in court-cases over this kind of thing in the past. I'm sure transgaming is only attempting to protect their own IP rights.
- Ender