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First:

    HiSax is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

However, if you wish to modify the HiSax sources, please note the following:

HiSax has passed the ITU approval test suite with ELSA Quickstep ISDN cards.
The certification is only valid for the combination of the tested software
version and the tested hardware. Any changes to the HiSax source code may
therefore affect the certification.

If you change the main files of the HiSax ISDN stack, the certification will
become invalid. Because in most countries it is illegal to connect
unapproved ISDN equipment to the public network, I have to guarantee that
changes in HiSax do not affect the certification.

In order to make a valid certification apparent to the user, I have built in
some validation checks that are made during the make process. The HiSax main
files are protected by md5 checksums and the md5sum file is pgp signed by
myself:

KeyID 1024/FF992F6D 1997/01/16 Karsten Keil <keil@temic-ech.spacenet.de>
Key fingerprint = 92 6B F7 58 EE 86 28 C8  C4 1A E6 DC 39 89 F2 AA

Only if the checksums are OK, and the signature of the file
"drivers/isdn/hisax/md5sums.asc" match, is the certification valid; a
message confirming this is then displayed during the hisax init process.

The affected files are:

drivers/isdn/hisax/isac.c
drivers/isdn/hisax/isdnl1.c
drivers/isdn/hisax/isdnl2.c
drivers/isdn/hisax/isdnl3.c
drivers/isdn/hisax/tei.c
drivers/isdn/hisax/callc.c
drivers/isdn/hisax/l3dss1.c
drivers/isdn/hisax/l3_1tr6.c
drivers/isdn/hisax/cert.c
drivers/isdn/hisax/elsa.c

Please send any changes, bugfixes and patches to me rather than implementing
them directly into the HiSax sources.

This does not reduce your rights granted by the GNU General Public License.
If you wish to change the sources, go ahead; but note that then the
certification is invalid even if you use ELSA Quickstep cards.

Here are the certification registration numbers for ELSA Quickstep cards:
German   D133361J CETECOM ICT Services GmbH 0682
European D133362J CETECOM ICT Services GmbH 0682


Karsten Keil
keil@isdn4linux.de

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