Patrice Dumas wrote:
Hello,
In TeX Live there are at least 2 licenses with the obligation to send
modifications:
* This is dvips, a freely redistributable PostScript driver
* for dvi files. It is (C) Copyright 1986-2004 by Tomas Rokicki.
* You may modify and use this program to your heart's content,
* so long as you send modifications to Tomas Rokicki. It can
* be included in any distribution, commercial or otherwise, so
* long as the banner string defined below is not modified (except
* for the version number) and this banner is printed on program
* invocation, or can be printed on program invocation with the -?
* option.
For makeindex there is a rather classical license with:
"All modified versions should be reported back to the author."
A requirement to send modifications to anybody is non-free. A request to
do so as in the Academic Free License is not.
Rahul