Arch Linux is popular as a base for other Linux distributions; examples of Arch-derivatives include EndeavourOS, Manjaro, Parabola, and SteamOS. There's one small problem: the control files used to describe how to build packages for Arch Linux have no stated license. That creates a bit of uncertainty about the rights and responsibilities for the downstream derivatives. So far, that doesn't seem to have been a problem, nor has it stopped other projects from assuming that reuse is allowed. However, the Arch project is looking to add some clarity by explicitly assigning a liberal license to its package sources. Currently the project is in the process of reaching out to contributors to see if they have any objections.