Comment 1 for bug 195111

"Copyright" file within the packages says:

/*[
 * Copyright 1986 - 1993, 1998, 2004 Thomas Williams, Colin Kelley
 *
 * Permission to use, copy, and distribute this software and its
 * documentation for any purpose with or without fee is hereby granted,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.
 *
 * Permission to modify the software is granted, but not the right to
 * distribute the complete modified source code. Modifications are to
 * be distributed as patches to the released version. Permission to
 * distribute binaries produced by compiling modified sources is granted,
 * provided you
 * 1. distribute the corresponding source modifications from the
 * released version in the form of a patch file along with the binaries,
 * 2. add special version identification to distinguish your version
 * in addition to the base release version number,
 * 3. provide your name and address as the primary contact for the
 * support of your modified version, and
 * 4. retain our contact information in regard to use of the base
 * software.
 * Permission to distribute the released version of the source code along
 * with corresponding source modifications in the form of a patch file is
 * granted with same provisions 2 through 4 for binary distributions.
 *
 * This software is provided "as is" without express or implied warranty
 * to the extent permitted by applicable law.
]*/

It is surely not a canonical free license, but it should be enough to keep it in universe.
Setting this bug as incomplete, would someone more expert than me to say something on that?