To clarify this, there is nothing in the GPL that forces you to distribute to anyone. E.g. you can make a highly modified GIMP for internal use in your company

To clarify this, there is nothing in the GPL that forces you to distribute to anyone. E.g. you can make a highly modified GIMP for internal use in your company and keep it closed source and internal. The only condition is that IF you distribute your program, you must also distribute the source code.