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DPROTECT.DOC
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1985-10-11
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DPROTECT - A disk protection scheme, Version 1.01 - 10/11/85
Copyright(c) 1985, GEE WIZ(tm) Software Company, ALL RIGHTS RESERVED
Written by Gee M. Wong for Public Domain use ONLY.
DPROTECT may not be sold, used in a commerical environment, nor packaged
with any commerical product without prior written permission from GEE WIZ
Software Company.
DPROTECT may be distributed freely at no cost to the recipient. User
support for this utility may be best obtained by notifing GEE WIZ.
NO SUBSCRIPTION IS NECESSARY FOR USER SUPPORT.
DPROTECT may be used to write protect one or more diskettes and all fixed
disks from Trojan Horse programs. DPROTECT may not be capable of protecting
any ram disk or external drives which do not resemble a standard IBM floppy
disk or hard disk drive.
DPROTECT has been tested on a 3270-PC, XT/370, and AT/370 equipped with the
standard floppy disk and hard disk drives and controllers supllied by IBM,
using PC-DOS(tm) 2.1 and 3.1.
When DPROTECT is executed, it will install itself as a resident program,
which will monitor the use of the BIOS level interupt 13H.
Everytime an I/O request is made, DPROTECT will intercept the request at the
BIOS level, interupt 13H, and determine if the request is being made against
a drive it is protecting. If the request being performed is against a
protected drive, then the requested is analyzed to determine if it is for a
service which will modify data on that drive. When both conditions have been
satisfied, DPROTECT will display a message on the screen informing you of a
detected update request, then wait for you to type any key. After it receives
a keystroke from you, it will then reboot your PC. This reboot is taken for
your protection; you can never know what some Trojan Horse Program will do
with your PC's RAM or I/O ports.
This version of DPROTECT is only able to intercept an I/O request at a BIOS
level. IT IS NOT ABLE TO SAFEGUARD AGAINST PROGRAMS WHICH ACCESS CODE IN ROM
THROUGH ITS ROM ADDRESS. Hopefully, an interpertive version of DPROTECT will
be available to circumvent those Trojan Horse programs which attempts to
execute ROM code directly.
Once a fixed disk or diskette is protected, the only way to remove the
protection is to reboot DOS.
To protect a disk or diskette, use the command:
DPROTECT drive
where drive is the letter of the drive you would like to have write protected,
or '*' for all drives.
The author has taken due care in developing and testing the effectiveness of
this utility, and makes no expressed or implied warranty of any kind with
regard to this utility. In no event shall the author or GEE WIZ Software
Company be liable for incidental or consequential damages in connection with
or arising out of the use of this utility.
If you feel that this utility is of value, please feel free to send your
generous contribution of $5.00, payable to Janet Huie, to:
GEE WIZ Sofware Company
10 Manton Avenue
East Brunswick, NJ 08816
c/o: Janet Huie
NOTES: GEE WIZ is a trademark of GEE WIZ Software Company.
PC-DOS is a trademark of Microsoft Incorporated.
PC-DOS is a trademark of International Bussiness Machines.