This is Debian/GNU Linux's prepackaged version of the 'slsc' utility.
'slsc' is a port of the classic Unix spreadsheet sc which uses the S-Lang
library by John E. Davis.  'slsc' was written by John E. Davis, previous
version of sc were written by James Gosling, Mark Weiser, Bruce Israel, 
Robert Bond and Alan Silverstein.

This package was put together by Dirk Eddelbuettel <edd@debian.org> from the
sources at space.mit.edu/pub/davis/slsc/slsc.tar.gz. No changes other than
adding the Debian package maintenance system were made.

There is no real copyright information in the original slsc.tar.gz. John
E. Davis other programs are all GPL'ed, though, and sc is public domain
legacy code. The file src/sc.c has the following header:

/*      SC      A Spreadsheet Calculator
 *              Main driver
 *
 *              original by James Gosling, September 1982
 *              modifications by Mark Weiser and Bruce Israel,
 *                      University of Maryland
 *
 *              More mods Robert Bond, 12/86
 *              More mods by Alan Silverstein, 3-4/88, see list of changes.
 *
 */