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Newsgroups: alt.sources,comp.dcom.modems,comp.protocols.misc
Path: wupost!psuvax1!uwm.edu!news.moneng.mei.com!sol.ctr.columbia.edu!xlink.net!scsing.switch.ch!swidir.switch.ch!newsfeed.ACO.net!Austria.EU.net!EU.net!uunet!omen!caf
From: caf@omen.UUCP (Chuck Forsberg WA7KGX)
Subject: Re: Other Unix Zmodems (was Re: zmtx/zmrx, zmodem implementation build from scratch)
Organization: Omen Technology INC, Portland Rain Forest
Date: Mon, 25 Jul 1994 01:22:50 GMT
Message-ID: <1994Jul25.012250.795@omen.UUCP>
References: <1994Jul23.065845.2584@omen.UUCP> <CtGtvG.36H@nntpa.cb.att.com>
Lines: 42
Xref: wupost alt.sources:10968 comp.dcom.modems:64187 comp.protocols.misc:3414
In article <CtGtvG.36H@nntpa.cb.att.com> bob@mtdcr.att.com writes:
>From article <1994Jul23.065845.2584@omen.UUCP>, by caf@omen.UUCP (Chuck Forsberg WA7KGX):
>> In article <GSHAPIRO.94Jul22194946@monkeyboy.WPI.EDU> gshapiro@monkeyboy.WPI.EDU (Gregory Neil Shapiro) writes:
>>>Is there any zmodem safe ground?
>>
>> There are a number of older rz/sz versions floating around up to 2.03
>> which are public domain. The README file in rz/sz 3.xx mentions this.
>
>I am curious to know precisely what the cutoff is. I had heard that
>it was "somewhere around April 1988." However, I saw a zmodem package
>on oak.oakland.edu that had the "pd" letters attached to the name.
>It turns out to be SZ 2.12 of 5/29/88 and RZ 2.03 of 5/17/88. Is this
>really public domain or did this one go beyond the cutoff date?
An early internal, non public domain rz/sz contained the zmr.c
file with the notation that it contained Omen Technology trade
secrets. That version did not include variable length headers.
When rz/sz with RLE was introduced in April 1989 it included
variable length headers and a strongly worded copyright notice.
From the April 1989 rz/sz archive README file:
"New for April 1989: ZMODEM compression and other compatible
extensions have been added to the rz and sz programs. Please
read the comments in the rz.c and sz.c source code for
licensing information for commercial use.
Previous versions of rz and sz (April 1988) remain Public Domain."
>
>If it did go beyond the cutoff date, how does one find the latest
>public domain version?
The current royalty free rz/sz is 2.03/2.16. This includes a
few bugfixes beyond the last pd released to Usenet. These files
are in the ZMODEM Developer's Collection ($89.00).
--
Chuck Forsberg WA7KGX caf@omen.COM 503-621-3406
Author of YMODEM, ZMODEM, Professional-YAM, ZCOMM, GSZ and DSZ
Omen Technology Inc "The High Reliability Software"
TeleGodzilla BBS: 503-621-3746 FAX:-3735 CIS:70007,2304