A quick glance showed me nothing that seemed to prevent downloading
the data files from the ftp site, but it does bring up the question of
whether the port of the main program was possible without violating
[6][d] or the equivelent clause in the EULA for the non-sharewhare
version of the game. (Assuming that a clause like [6][D] is in fact
enforceable.)
Please note that the source code hast been released on December 20,
2002. This is more than 8 years later than the release of the shareware
version which contains the `VENDOR.DOC' file.
The original source code is released under the terms of the GPL and can
be found at <ftp://ftp.3drealms.com/source/rottsource.zip/>.