This software is made freely available "as is" for your use.  You
may modify the software in any way that you wish.  No warranty is
made as to the suitability of this software for any particular 
purpose; the user takes all risks for its use.  No copyright,
trademark, or patent claims are made on this software or its name.
Source code can be found by anonymous ftp to theory.lcs.mit.edu
and looking in the pub/rivest/bibtag directory.