On the other hand, wouldn't you better be asking for that info at their site?
Q: If a library is released under the GPL (not the LGPL), does that mean that any program which uses it has to be under the GPL?
A: Yes, because the program as it is actually run includes the library.
Q: If a programming language interpreter is released under the GPL, does that mean programs written to be interpreted by it must be under GPL-compatible licenses?
A: When the interpreter just interprets a language, the answer is no. [...]
Q: If I add a module to a GPL-covered program, do I have to use the GPL as the license for my module?
A: The GPL says that the whole combined program has to be released under the GPL. So your module has to be available for use under the GPL.
But you can give additional permission for the use of your code. [...]
Q: If a program released under the GPL uses plug-ins, what are the requirements for the licenses of a plug-in?
A: It depends on how the program invokes its plug-ins. If the program uses fork and exec to invoke plug-ins, then the plug-ins are separate programs, so the license for the main program makes no requirements for them.
If the program dynamically links plug-ins, and they make function calls to each other and share data structures, we believe they form a single program, so plug-ins must be treated as extensions to the main program. This means they must be released under the GPL [...]
Does anyone know what program(s) might have been used to produce these stats as I'd find it a very useful tool to have while trying to optimize my site.