possible licensing issues with some scsh source files

[Daniel Kobras <kobras@debian.org>]

Hi!

We're currently trying to sort out the non-free status of scsh within
Debian. Most of the issues are unambiguous, however, I'd like to see
some more opinions on the following two clauses contained in a couple of
source files.

scsh-0.6.4/scheme/big/sort.scm:

;;; 2. Users of this software agree to make their best efforts (a) to return
;;;    to the T Project at Yale any improvements or extensions that they make,
;;;    so that these may be included in future releases; and (b) to inform
;;;    the T Project of noteworthy uses of this software.
;;; 3. All materials developed as a consequence of the use of this software
;;;    shall duly acknowledge such use, in accordance with the usual standards
;;;    of acknowledging credit in academic research.

(srfi/srfi-13.scm and srfi-14.scm contain similar stuff, with the MIT
scheme project instead of T Project at Yale.)

Thanks,

Daniel.