GPL restrictions don't come into play until the point of redistribution. That is at least true for GPLv2, and I'm pretty sure for v3, but I don't know it at al

GPL restrictions don't come into play until the point of redistribution. That is at least true for GPLv2, and I'm pretty sure for v3, but I don't know it at all. In short, I can modify the GPL source of an application all I like if it's an "in-house tool", and I am not required to resubmit my changes. It's only if I attempt to sell it or redistribute the application in some way that I am required to. That is not an IP violation.