Software, it is always easy to comply with the GPL. However,

admittedly to the dismay of FSF, many modern and complex software

systems are built using both proprietary and GPL'd components that are

clearly and legally separate and independent works, merely aggregated

together on the same device.

exchange for this amazing benefit, the license requires that the modifier gives

back to the commons that made the work easier in the first place. It is a

reasonable trade-off and a way to help build a better world while also

making a profit.

Note that FSF does provide services to assist companies who need