Francesco P. Lovergine wrote: > Is it possible for an upstream to change license from a BSD-old to GPL? > Consider the hypothesis that the product is a derivative work with a > few old contributors. I see no reasons to do not relicense after adding > a credits note as required in the BSD license. > > Comments?
4-clause BSD has a requirement in clause 3 which applies to all derived works and is not required in the GPL. The GPL does not allow distribution of GPL-licensed works with requirements which go beyond the requirements of the GPL. Accordingly, you need to get all the old copyright holders to relicense under 3-clause BSD (at a minimum). -- There are none so blind as those who will not see.
