> The userspace ABI is stable and intended not to cause anything targeting it to become a derived work. > the only thing forcing modules to be GPLv2-compatible

> The userspace ABI is stable and intended not to cause anything targeting it to become a derived work. > the only thing forcing modules to be GPLv2-compatible is the rate of change of the kernel mode ABI making it impractical to target it via cleanroom methods. What is licensed is a specific source code version, not the history of previous versions. For a specific revision, there is no meaning to "more stable". What makes userspace programs non-derived work is the syscall exception: https://github.com/torvalds/linux/blob/master/LICENSES/exceptions/Linux-syscall-note https://github.com/torvalds/linux/blob/master/LICENSES/excep...