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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.
-
-