On Sun, 30 Jun 2002, Frank Mittelbach wrote:

> indeed. and even more, what about the sitation like with the TeX program
> itself? It is not distributed under LPPL but essentially in the same spirit:
> don't change me unless you are either Don Knuth or change the name.

I believe this is about the trademark behind the name TeX, and not the
license.

roozbeh