What does "Tainted: P" or "Tainted: GF" mean?

[Lei Ming]

Sorry for asking this silly question:

When I use lsmod to list all the modules, it displays "Tainted: P", and 
on my friend's machine it's "Tainted: GF".

I know what "Tainted" mean, but what does "P" or "GF" mean? If there are 
others than these two, where can I find a list?

Thanks.

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