I'm helping a medicine student to build a Linux distribution which should include some imaging processing tools. The aim is give to the other students a bootable USB stick to be used for their researches. Nothing new.

Each processing tool comes with a specific license, and we will contact the authors if an authorization is required.

My question is: with which kind of license should we release the distribution? Should the license be the more restrictive between the ones of the included packages or the distribution maintains its original license and each package refers to its own license?