The "short list" of contributors to this project is over 50 names long. Presumably each of those people has given their blessing for their software to be included in this package. Now, just going out on a limb, is it not also possible that one of the rights-holders to whatever software has people all up-in-arms today also gave their permission? Just hypothetically speaking, and all.
Instead of everyone assuming "OMG they don't have rights to distribute this stuff", how about everybody just assume that they do, until proven otherwise?