But OFF TOPIC I guess...
A few words from the ReadMe...
"DOS Navigator(tm) 1.50 is Shareware, i.e. is
distributed freely
and payment is proceeded only for registration. You are
obliged to register DOS Navigator 1.50 (with local
dealer or via credit card online WWW registration
http://www.ritlabs.com/dn/register.html) before the
expiry of 21-day period of using it or to refuse of its
further use."
From the readme for 1.51
Dos Navigator Version 1.51 Copyright (C) 1991-99 RIT Research
Labs
All rights reserved.
The current version of Dos Navigator is available at
http://www.ritlabs.com/dn/
This product is free for commercial and non-commercial use as
long as
the following conditions are aheared to.
Copyright remains RIT Research Labs, and as such any Copyright
notices
in the code are not to be removed. If this package is used in a
product, RIT Research Labs should be given attribution as the
RIT Research
Labs of the parts of the library used. This can be in the form
of a textual
message at program startup or in documentation (online or
textual)
provided with the package.
Redistribution and use in source and binary forms, with or
without
modification, are permitted provided that the following
conditions are
met:
1. Redistributions of source code must retain the copyright
notice, this list of conditions and the following
disclaimer.
2. Redistributions in binary form must reproduce the above
copyright
notice, this list of conditions and the following disclaimer
in the
documentation and/or other materials provided with the
distribution.
3. All advertising materials mentioning features or use of this
software
must display the following acknowledgement:
"Based on Dos Navigator by RIT Research Labs."
THIS SOFTWARE IS PROVIDED BY RIT RESEARCH LABS "AS IS" AND ANY
EXPRESS
OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE
LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE
GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
WHETHER
IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
EVEN IF
ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.