You have to license any code that links with GPL code under the GPL. This does not prevent you from dual-licensing your own portion of the code base, or shippin

You have to license any code that links with GPL code under the GPL. This does not prevent you from dual-licensing your own portion of the code base, or shipping non-GPL, non-linked code as part of the same product (Although in the case of things like DLL plugins it gets a bit hazy) Actually, that's a common, but wrong interpretation. The whole work becomes GPL, but the code that links to GPL code doesn't have to be GPL.