7gmadiso@pomona.bitnet.UUCP (04/07/87)
COMMON QUESTIONS AND ANSWERS
Q: Can I use XARC4 to distribute my public domain or freeware program?
A: Yes, of course.
Q: Can I use XARC4 to distribute my commercial software package?
A: Yes. Please contact SEA for a commercial distribution license.
Q: I'm a commercial user. Why should I pay for freeware that others get for
free?
A: Because you cannot credibly plead poverty. Freeware, all freeware, is an
attempt to develop a new marketing channel to the benefit of everyone. You
can still "test drive" freeware for a short period, but if you decide to use
it in your business, then you should pay for it.
Q: How can I get the latest version of XARC4?
A: XARC4 updates are distributed through normal freeware channels, and by
FidoNet.
REVISION HISTORY
Version 01.00.00 02/14/87 of XARC4/CMD was released on 02/15/87.
PROGRAM HISTORY AND CREDITS
XARC4/CMD is based on ARC Version 5.1.2 of System Enhancement Associates.
Thom Henderson graciously gave his permission to release a modified version of
XARC for the TANDY Model IV users on 12/11/86.
While a number of changes and adaptations had to be made to the existing
source code (including eliminating some features like the old Lempel-Zev
crunching), the majority of the program is the original work of SEA, now,
almost 2 years old. The following is the program history and credits, as
described by SEA, for MS-DOS ARC:
In its short life thus far, ARC has astounded us with its popularity. We
first wrote it in March of 1985 because we wanted an archive utility that used
a distributive directory approach, since this has certain advantages over the
more popular central directory approach. We added automatic squeezing in
version 2 at the prompting of a friend. In version 2.1 we added the code to
test for the best compression method.
Now (in October of 1985) we find that our humble little program has spread
across the country, and seems to have become a new institution.
We are thankful for the support and appreciation we have received. We hope
that you find this program of use.
If we have achieved greatness, it is because we have stood upon the
shoulders of giants. Nothing is created as a thing unto itself, and ARC is no
exception. Therefore, we would like to give credit to the following people,
without whose efforts ARC could not exist:
Brian W. Kernighan and P. J. Plauger, whose book "Software Tools" provided
many of the ideas behind the distributive directory approach used by ARC.
Dick Greenlaw, who wrote the public domain SQ and USQ programs, in which the
Huffman squeezing algorithm was first developed.
Robert J. Beilstein, who adapted SQ and USQ to Computer Innovations C86 (the
language we use), thus providing us with important parts of our squeezing
logic.
Kent Williams, who graciously allowed us to use his LZWCOM and LZWUNC
programs as a basis for our Lempel-Zev compression logic, and who continues to
make valuable contributions.
David Schwaderer, whose article in the April 1985 issue of PC Tech Journal
provided us with the logic for calculating the CRC 16 bit polynomial.
Terry A. Welch, whose article "A Technique for High Performance Data
Compression", IEEE Computer Vol 17 No. 6 (June 1984) seems to have started all
the research on Lempel-Zev coding.
Spencer W. Thomas, Jim McKie, Steve Davies, Ken Turkowski, James A. Woods,
and Joe Orost, who are the authors of the UNIX compress utility.
And many, many others whom we could not identify.
SITE LICENSE
Corporate users may wish to obtain a site license for the use of XARC4.
Please use the order form in this manual to order a site license. Site licenses
are granted as of when SEA receives your payment. License fees vary depending
on the number of computers on which XARC4 will be used, as follows:
1 to 9 copies $35 each
10 to 24 copies $25 each
25 to 49 copies $20 each
50 to 99 copies $15 each
over 99 copies $1500 one time fee
The following is a site license agreement, which should be signed and sent
with your payment when ordering a commercial site license.
Site License Agreement
The use of XARC4 in a commercial environment or government organization is
granted under the following terms:
1. Payment of the license fee must be made to System Enhancement Associates.
The fee is based on the number of computers which will be used to run XARC4,
as follows:
1 to 9 copies $35 each
10 to 24 copies $25 each
25 to 49 copies $20 each
50 to 99 copies $15 each
over 99 copies $1500 one time fee
2. You may use XARC4 on the number of computers included in the license fee. If
you have paid the fee for over 99 copies, then you may use XARC4 on any
number of computers within your organization.
3. You may make copies of the program, in its original, unmodified form,
without restriction. You may distribute these copies of the program without
restriction.
4. If these copies are distributed outside of your organization, you have no
obligation to control the use of those copies which are outside of your
organization.
5. You may make copies of the program documentation, in both its printed form
and machine readable form, without restriction.
6. You may use future versions of XARC4 under this license.
7. You may NOT modify the program or charge a fee for copying or distributing
the program.
8. It is your responsibility to make the necessary copies and to deliver them
to the computers which they will be used on.
I agree to abide by the terms and conditions of this license.
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Check which items you wish to purchase:
(_) Noncommercial license for the use of XARC4.
(_) Commercial license for the use of XARC4 on ___ computers (see price
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FidoNet address
Send this completed form to:
System Enhancement Associates
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For commercial site license orders, please enclose a signed copy of the site
license agreement.