In the world of FOSS, a small change to a license can be a big deal. For users of proprietary software, changes in the EULA are hardly even registered. Those users click “Ok” and forget about it in the blink of an eye. They have accepted that they are severely limited as far as their rights to alter or redistribute the software is concerned.
But for users of free software, such as Linux or any of the hundreds of packages that make up a modern operating system, a license change has the potential to change their rights dramatically.