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18-09-88/T\DFS06
This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.
Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.
| Tape/disk: | Home » CEEFAX disks » telesoftware9.adl |
| Filename: | 18-09-88/T\DFS06 |
| Read OK: | ✔ |
| File size: | 5392 bytes |
| Load address: | 0000 |
| Exec address: | FFFFFFFF |
File contents
The Acorn DFS Osword commands - by - Gordon Horsington
----------------------------------------------------------
Module 6. Creating copy-protected single density discs
------------------------------------------------------
+----------------------------------------------------------+
| All the DFS modules in this series use programs which |
| experiment with the format and contents of discs. These |
| experiments may have disasterous effects if you use any |
| of the programs on discs which store programs or data |
| which you cannot afford to lose. You should first try |
| out the programs using discs that have either been |
| duplicated or, better still, have not been used at all. |
+----------------------------------------------------------+
In this module I will describe in detail one method of producing copy-
protected single density discs. This type of disc is designed to prevent
other people seeing how your programs work and to stop them duplicating
the disc. Meeting the first objective is relatively easy. Meeting the
second objective is virtually impossible. It is easy to prevent amateur
piracy using duplicating programs but you will never be able to stop a
determined hacker undoing all your efforts to prevent duplication. I have
not yet found a commercially produced copy-protected disc for the BBC
range of computers which can not have all the protection removed so that
the disc can be duplicated with the *BACKUP command.
If you choose to copy-protect your discs you will at least indicate to the
users of your software that you are unwilling to have the disc duplicated.
To stand the best chance of defeating a hacker you should use the method
described in this module as a starting point for developing your own ideas
about protection. Remember that everyone reading this module will know how
to undo the protection by just reversing the steps in the procedure. You
should at least aim to produce a disc which cannot be duplicated by either
of the two disc duplicators described in the next module. This will not be
easy but all the information you need to do it has been or will be
presented in this series. You might like to consider using Bad Tracks,
Unusual logical sector numbers and logical track numbers in unexpected
combinations, encrypted machine code programs and multiple files which use
unusual methods of writing to and reading from the disc. What you do is up
to you but you must try to think like a hacker if you want to prevent your
software being hacked.
The method used to introduce copy-protection will use a single density
disc formatted with 5 sectors per track instead of the usual 10 sectors
per track. The data will be stored on the disc using the Write Deleted
Data command as an extra protection.
A disc cannot be formatted with 5 sectors per track using the DFS
formatter and so the first step in this procedure will be to write a
special disc formatting program. The program SECTOR5 can be used to
produce an object code file which, in turn, can be used to produce a
single density disc with a standard track &00 and the rest of the disc
formatted with 5 sectors on every track. Each of the non-standard tracks
is capable of storing 2.5k of data in 5 sectors, ie. 512 bytes per sector.
The object code file produced by SECTOR5 is exactly 1k long and can be
stored in two of the 512 byte sectors. I will use this object code file as
an example for producing the required copy-protected disc.
Run the program SECTOR5 and, when prompted, give a suitable filename for
the object code file. In the rest of this module I will refer to the
object code file produced by SECTOR5 as FORM5.
10 REM: SECTOR5
20 DIM mcode &500
30 zeropage=&70
40 oswrch=&FFEE
50 osword=&FFF1
60 osbyte=&FFF4
70 osnewl=&FFE7
80 oswrch=&FFEE
90 osrdch=&FFE0
100 osasci=&FFE3
110 FORpass=4 TO 6 STEP 2
120 O%=mcode
130 P%=PAGE+&100
140 [ OPT pass
150 .firstbyte
160 EQUW &FF0D \ NEW the BASIC program
170 .start
180 LDA #&0F
190 JSR osasci \ scroll mode
200 LDX #title MOD 256
210 LDY #title DIV 256
220 JSR print \ print title
230 .getdata
240 LDX #drivenum MOD 256
250 LDY #drivenum DIV 256
260 JSR print \ which drive?
270 .whichdrive
280 JSR osrdch
290 BCS escape
300 SEC
310 SBC #ASC("0")
320 BMI whichdrive \ drive 0-3
330 CMP #&04
340 BCS whichdrive \ drive 0-3
350 STA block \ format parameter block
360 STA catblock \ catalogue parameter block
370 ADC #ASC("0")
380 JSR osasci \ print 0, 1, 2 or 3
390 LDX #tracknum MOD 256
400 LDY #tracknum DIV 256
410 JSR print \ 40 or 80 tracks?
420 .whichtrack
430 JSR osrdch
440 BCS escape
450 LDX #&27 \ 40 tracks
460 CMP #ASC("4")
470 BEQ continue
480 CMP #ASC("8")
490 BNE whichtrack
500 LDX #&4F \ 80 tracks
510 .continue
520 STX finish \ store number of tracks
530 JSR osasci \ print "8" or "4"
540 LDA #ASC("0")
550 JSR osasci \ print "0" to make "40" or "80"
560 LDX #ready MOD 256
570 LDY #ready DIV 256
580 JSR print \ ready to format?
590 JSR osrdch
600 BCS escape
610 PHA \ temp store for answer
620 JSR osasci \ print answer
630 JSR osnewl
640 PLA \ pull answer
650 AND #&DF \ upper case
660 CMP #ASC("Y")
670 BNE getdata
680 JSR osnewl
690 LDA #0
700 STA track
710 LDA #&01 \ data size
720 LDX #&10 \ gap 3
730 LDY #&2A \ number of sectors
740 JSR setup
750 LDA #&7F
760 LDX #block MOD 256
770 LDY #block DIV 256
780 JSR osword \ format track 0 ten sectors
790 LDA result \ load result byte
800 BEQ trackzero \ format OK if result = 0
810 .error
820 BRK
830 BRK
840 EQUS "Format error"
850 BRK
860 .escape
870 LDA #&7E
880 JSR osbyte \ acknowledge Escape
890 BRK
900 BRK
910 EQUS "Escape"
920 BRK
930 .trackzero
940 LDA #&7F
950 LDX #catblock MOD 256
960 LDY #catblock DIV 256
970 JSR osword \ store empty catalogue
980 LDA catresult \ check result byte
990 BNE error \ quit if error
1000 JSR printbyte \ print track 00
1010 .loop
1020 LDA &FF \ poll escape flag
1030 BMI escape \ bit 7 set if Escape pressed
1040 INC track \ increment track number
1050 LDA #&02 \ data size
1060 LDX #&4A \ gap 3
1070 LDY #&45 \ number of sectors
1080 JSR setup
1090 LDA #&7F
1100 LDX #block MOD 256
1110 LDY #block DIV 256
1120 JSR osword \ format track with 5 sectors
1130 LDA result \ load result byte
1140 BNE error \ quit if error
1150 LDA track \ load track number
1160 PHA
1170 JSR printbyte \ print track number
1180 PLA
1190 CMP finish \ is that the last track?
1200 BCC loop \ branch if more tracks to format
1210 LDX #another MOD 256
1220 LDY #another DIV 256
1230 JSR print \ another?
1240 JSR osrdch
1250 BCS escape
1260 PHA \ temp store for answer
1270 JSR osasci \ print answer
1280 JSR osnewl
1290 PLA \ pull answer
1300 AND #&DF \ upper case
1310 CMP #ASC("Y")
1320 BNE return
1330 JMP getdata
1340 .setup
1350 STX gap3
1360 STY numsectors
1370 LDX #39
1380 LDY track
1390 STY physical
1400 .setloop
1410 STA table,X
1420 DEX
1430 DEX
1440 DEX
1450 PHA
1460 TYA
1470 STA table,X
1480 PLA
1490 DEX
1500 BPL setloop
1510 .return
1520 RTS
1530 .print
1540 STX zeropage
1550 STY zeropage+1
1560 LDY #0
1570 .printloop
1580 LDA (zeropage),Y
1590 BEQ endprint
1600 JSR osasci
1610 INY
1620 BNE printloop
1630 .endprint
1640 RTS
1650 .printbyte
1660 PHA
1670 LSR A
1680 LSR A
1690 LSR A
1700 LSR A
1710 JSR nybble \ print MS nybble
1720 PLA
1730 JSR nybble \ print LS nybble
1740 LDA #ASC(" ")
1750 JSR oswrch \ print space
1760 JMP oswrch \ print space
1770 .nybble
1780 AND #&0F
1790 SED
1800 CLC
1810 ADC #&90
1820 ADC #&40
1830 CLD
1840 JMP oswrch \ print nybble and return
1850 .block
1860 EQUB &00 \ drive number 0-3
1870 EQUD table \ sector table
1880 EQUB &05 \ 5 parameters
1890 EQUB &63 \ format track
1900 .physical
1910 EQUB &00 \ physical track number 0
1920 .gap3
1930 EQUB &15 \ gap 3
1940 .numsectors
1950 EQUB &2A \ 10 sectors of 256 bytes
1960 EQUB &00 \ gap 5
1970 EQUB &10 \ gap 1
1980 .result
1990 EQUB &00 \ result byte
2000 .table
2010 EQUD &00000000
2020 EQUD &00010000
2030 EQUD &00020000
2040 EQUD &00030000
2050 EQUD &00040000
2060 EQUD &00050000
2070 EQUD &00060000
2080 EQUD &00070000
2090 EQUD &00080000
2100 EQUD &00090000
2110 .catalogue
2120 EQUB &15 \ disc title (disable VDU)
2130 OPT FNfill(7) \ 7 zero bytes
2140 EQUS "!BOOT $" \ next 8 bytes
2150 OPT FNfill(240) \ end of first sector
2160 OPT FNfill(5) \ start of second sector
2170 EQUB &08 \ number of files * 8
2180 EQUW &0A20 \ 10 sectors and *OPT 4,2
2190 EQUD &00 \ load and exec = &0000
2200 EQUW &0800 \ length = &800 bytes
2210 EQUB &00 \ MS 2 bits of sector number
2220 EQUB &02 \ starting at sector 2
2230 OPT FNfill(240)
2240 .catblock
2250 EQUB &00 \ drive number
2260 EQUD catalogue \ address of buffer
2270 EQUB &03 \ number of parameters
2280 EQUB &4B \ save data multi sector
2290 EQUB &00 \ logical track
2300 EQUB &00 \ start logical sector
2310 EQUB &22 \ 2 sectors of 256 bytes
2320 .catresult
2330 EQUB &00 \ result byte
2340 .title
2350 EQUB &0D
2360 EQUS "5 Sector DFS Format"
2370 EQUB &0D
2380 BRK
2390 .drivenum
2400 EQUB &0D
2410 EQUS "Drive number? (0-3) "
2420 BRK
2430 .tracknum
2440 EQUB &0D
2450 EQUS "40 or 80 tracks? (4/8) "
2460 BRK
2470 .ready
2480 EQUB &0D
2490 EQUS "Ready to format? (Y/N) "
2500 BRK
2510 .another
2520 EQUB &0D
2530 EQUS "Another? (Y/N) "
2540 BRK
2550 .track
2560 EQUB &00 \ physical track number
2570 .finish
2580 EQUB &00 \ last track number
2590 .lastbyte
2600 ]
2610 NEXT
2620 INPUT'"Save filename = "filename$
2630 IF filename$ = "" THEN END
2640 *OPT1,2
2650 OSCLI("SAVE "+filename$+" "+STR$~(mcode)+"+"+STR$~(las
tbyte-firstbyte)+" "+STR$~(start)+" "+STR$~(firstbyte))
2660 *OPT1,0
2670 END
2680 DEF FNfill(size)
2690 FOR count = 1 TO size
2700 ?O%=0
2710 O%=O%+1
2720 P%=P%+1
2730 NEXT
2740 =pass
There are a number of points worth noting about the program SECTOR5. The
object code is used to create a 5 sector per track formatted disc and, for
the sake of demonstrating the protection techniques, the object code will
also be stored on the disc it formats. The program assembles the object
code to run at PAGE+&100. This is so that the programs which will be used
to store the object code on a protected disc and to read that code back
from the disc can be located at PAGE. These saving and loading programs
are very short and &100 bytes is more than enough room for them. When you
design your own protection system you may need more space for your saving
and loading programs.
The formatting program introduced in module 3 created an empty catalogue
which only contained the number of sectors available on the disc. The
catalogue created by the program above actually contains a disc title,
some file information and the start up option. The disc title is the ASCII
character &15 which disables the VDU and so prevents the disc being
catalogued. The dummy file $.!BOOT is entered into the catalogue and it is
specified as &800 bytes long starting in sector &02. This means that the
dummy !BOOT file uses all the available space on track &00. The number of
available sectors on the disc is specified as &0A and so the catalogue and
the dummy !BOOT file use all the available space on the disc. The start up
option is equivalent to *OPT 4,2 so that the !BOOT file will be *RUN on
Shift+Break. This formatting program produces the sector map shown in
figure 1. You can see that it has not been optimised for speed and you may
like to modify using the logical sector offsets described in module 3.
DFS format physical sector numbers
| 00 01 02 03 04 05 06 07 08 09
---+---------------------------------------
T 00 | 00 01 02 03 04 05 06 07 08 09
r 01 | 01 02 03 04 05 Logical
a 02 | 01 02 03 04 05 sector
c 03 | 01 02 03 04 05 numbers
k 04 | 01 02 03 04 05
s 05 | 01 ...
Figure 1. The distribution of logical sectors
---------------------------------------------
When the disc has been formatted you can use the program IDSDUMP (from
module 0) to check the ID fields and the program VERIFY (also from module
0) to verify the format.
The object code program FORM5, which is used to format the disc, can be
stored on the newly formatted disc using the object code generated by the
program ENCODE. Run ENCODE and choose a suitable filename for the object
code it produces when prompted. For the sake of this demonstration I will
assume that you will call it SAVE5. The object code program SAVE5 will
save the &400 byte program FORM5 onto the first two logical sectors of
track &01, storing the data as deleted data.
*LOAD FORM5 and then type *RUN SAVE5. Swap the DFS disc for the newly
formatted 5 sector per track disc and press the spacebar. The object code
program FORM5 will be stored on the disc. You can use the program VERIFY
to make sure that the data is sucessfully stored as deleted data.
10 REM: ENCODE
20 DIM mcode &100
25 page=PAGE
30 osrdch=&FFE0
40 oswrch=&FFEE
50 osword=&FFF1
60 FORpass=4 TO 6 STEP 2
70 O%=mcode
80 P%=page
90 [ OPT pass
100 .firstbyte
110 EQUW &FF0D \ NEW the BASIC program
120 .start
130 LDX #&00
140 .loop
150 LDA message,X
160 BEQ end
170 JSR oswrch
180 INX
190 BNE loop
200 .end
210 JSR osrdch
220 BCC save
230 BRK
240 BRK
250 EQUS "Escape"
260 BRK
270 .save
280 LDA #&7F
290 LDX #block MOD 256
300 LDY #block DIV 256
310 JSR osword \ write deleted data
320 LDA result \ load result byte
330 AND #&1E \ isolate error code
340 BNE error
350 BRK
360 BRK
370 EQUS "Write OK"
380 .error
390 BRK
400 BRK
410 EQUS "Write failed"
420 BRK
430 .block
440 EQUB &FF \ current drive
450 EQUD page+&100 \ start at PAGE+&100
460 EQUB &03 \ 3 parameters
470 EQUB &4F \ write deleted multi-sector
480 EQUB &01 \ logical track &01
490 EQUB &00 \ start logical sector &00
500 EQUB &42 \ 2 sectors of 512 bytes
510 .result
520 EQUB &00 \ result byte
530 .message
540 EQUS "Press Space to save data on current disc"
550 BRK
560 .lastbyte
570 ]
580 NEXT
590 INPUT'"Save filename = "filename$
600 IF filename$ = "" THEN END
610 *OPT1,2
620 OSCLI("SAVE "+filename$+" "+STR$~(mcode)+"+"+STR$~(las
tbyte-firstbyte)+" "+STR$~(start)+" "+STR$~(firstbyte))
630 *OPT1,0
640 END
The data stored on the disc using SAVE5 cannot be read back off the disc
using any of the DFS star commands. The disc has been formatted so that a
!BOOT file will be *RUN on Shift+Break and so the dummy !BOOT file entered
into the catalogue by the formatting program needs to be replaced with a
real !BOOT file which will load and run the program stored on track &01.
The program DECODE will produce an appropriate machine code !BOOT file
which simply reverses the Write Deleted Data operation which put the data
onto the disc. When the deleted data have been reloaded into memory the
command CALL (PAGE+&102) <Return> is inserted into the keyboard buffer,
and BASIC is entered using Osbyte &8E. The VDU is disabled before
inserting the data into the keyboard buffer (lines 460-470) and re-enabled
before the command is executed (line 610). This hides what you are doing
from the disc user. Any command, or series of commands, can be executed in
this way so that BASIC programs as well as machine code programs can be
stored on, and run from, the copy-protected disc.
The optional code in lines 140 to 230 of DECODE can be used to further
protect your software but you should start to think of your own ideas to
incorporate with these techniques. Disc copy-protection is only useful if
it is unique and very difficult to break. These programs are neither but
they are a good introduction to the necessary techniques and the discs
they produce cannot be duplicated with the *BACKUP command.
10 REM: DECODE
20 page=PAGE
30 DIM mcode &100
40 osasci=&FFE3
50 osword=&FFF1
60 osbyte=&FFF4
70 FORpass=4 TO 6 STEP 2
80 O%=mcode
90 P%=page
100 [ OPT pass
110 .firstbyte
120 EQUW &FF0D \ NEW the BASIC program
130 .start
140 \ LDA #&C8 \ write Break effect
150 \ LDX #&02 \ clear memory on Break
160 \ LDY #&00
170 \ JSR osbyte
180 \ LDA #&4C \ JMP opcode
190 \ LDX #&87 \ JMP &287 gives an
200 \ LDY #&02 \ endless loop on Break
210 \ STA &287
220 \ STX &288
230 \ STY &289
240 LDA #&7F
250 LDX #block MOD 256
260 LDY #block DIV 256
270 JSR osword \ read deleted data
280 LDA result \ load result byte
290 AND #&1E \ isolate error code
300 BNE error
310 LDA #&FF \ initialise offset
320 PHA \ save offset
330 .pull
340 PLA
350 TAX
360 INX \ increment offset
370 TXA
380 PHA \ store current offset
390 LDY keyboard,X \ load byte for keyboard buffer
400 BEQ continue \ branch if finished
410 LDX #0
420 LDA #&8A
430 JSR osbyte \ put byte into keyboard buffer
440 JMP pull
450 .continue
460 LDA #&15
470 JSR osasci \ disable VDU
480 LDA #&BB
490 LDX #0
500 LDY #&FF
510 JSR osbyte \ find BASIC
520 LDA #&8E
530 JMP osbyte \ select BASIC no return
540 .error
550 BRK
560 BRK
570 EQUS "Disc read error"
580 BRK
590 .keyboard
600 EQUS "CALL &"+STR$~(page+&102)
610 EQUB &06 \ enable VDU
620 EQUB &0D
630 BRK
640 .block
650 EQUB &FF \ current drive
660 EQUD page+&100 \ start at PAGE+&100
670 EQUB &03 \ 3 parameters
680 EQUB &57 \ read deleted multi-sector
690 EQUB &01 \ logical track &01
700 EQUB &00 \ start logical sector 0
710 EQUB &42 \ 2 sectors of 512 bytes
720 .result
730 EQUB &00 \ result byte
740 .lastbyte
750 ]
760 NEXT
770 PRINT'"Press Space to save !BOOT file"
780 REPEAT
790 UNTIL GET=32
800 *OPT1,2
810 OSCLI("SAVE $.!BOOT "+STR$~(mcode)+"+"+STR$~(lastbyte-
firstbyte)+" "+STR$~(start)+" "+STR$~(firstbyte))
820 *OPT1,0
00000000 54 68 65 20 41 63 6f 72 6e 20 44 46 53 20 4f 73 |The Acorn DFS Os|
00000010 77 6f 72 64 20 63 6f 6d 6d 61 6e 64 73 20 20 2d |word commands -|
00000020 20 20 62 79 20 20 2d 20 20 47 6f 72 64 6f 6e 20 | by - Gordon |
00000030 48 6f 72 73 69 6e 67 74 6f 6e 0d 2d 2d 2d 2d 2d |Horsington.-----|
00000040 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------|
*
00000070 2d 2d 2d 2d 2d 0d 0d 4d 6f 64 75 6c 65 20 36 2e |-----..Module 6.|
00000080 20 43 72 65 61 74 69 6e 67 20 63 6f 70 79 2d 70 | Creating copy-p|
00000090 72 6f 74 65 63 74 65 64 20 73 69 6e 67 6c 65 20 |rotected single |
000000a0 64 65 6e 73 69 74 79 20 64 69 73 63 73 0d 2d 2d |density discs.--|
000000b0 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------|
*
000000e0 2d 2d 2d 2d 0d 0d 20 20 20 20 20 20 2b 2d 2d 2d |----.. +---|
000000f0 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------|
*
00000120 2d 2d 2d 2d 2d 2d 2d 2b 0d 20 20 20 20 20 20 7c |-------+. ||
00000130 20 41 6c 6c 20 74 68 65 20 44 46 53 20 6d 6f 64 | All the DFS mod|
00000140 75 6c 65 73 20 69 6e 20 20 74 68 69 73 20 20 73 |ules in this s|
00000150 65 72 69 65 73 20 20 75 73 65 20 70 72 6f 67 72 |eries use progr|
00000160 61 6d 73 20 77 68 69 63 68 20 7c 0d 20 20 20 20 |ams which |. |
00000170 20 20 7c 20 65 78 70 65 72 69 6d 65 6e 74 20 20 | | experiment |
00000180 77 69 74 68 20 74 68 65 20 66 6f 72 6d 61 74 20 |with the format |
00000190 61 6e 64 20 63 6f 6e 74 65 6e 74 73 20 6f 66 20 |and contents of |
000001a0 64 69 73 63 73 2e 20 54 68 65 73 65 20 7c 0d 20 |discs. These |. |
000001b0 20 20 20 20 20 7c 20 65 78 70 65 72 69 6d 65 6e | | experimen|
000001c0 74 73 20 6d 61 79 20 20 68 61 76 65 20 64 69 73 |ts may have dis|
000001d0 61 73 74 65 72 6f 75 73 20 65 66 66 65 63 74 73 |asterous effects|
000001e0 20 69 66 20 79 6f 75 20 75 73 65 20 61 6e 79 20 | if you use any |
000001f0 7c 0d 20 20 20 20 20 20 7c 20 6f 66 20 74 68 65 ||. | of the|
00000200 20 70 72 6f 67 72 61 6d 73 20 20 6f 6e 20 20 64 | programs on d|
00000210 69 73 63 73 20 20 77 68 69 63 68 20 73 74 6f 72 |iscs which stor|
00000220 65 20 70 72 6f 67 72 61 6d 73 20 6f 72 20 64 61 |e programs or da|
00000230 74 61 20 7c 0d 20 20 20 20 20 20 7c 20 77 68 69 |ta |. | whi|
00000240 63 68 20 79 6f 75 20 63 61 6e 6e 6f 74 20 61 66 |ch you cannot af|
00000250 66 6f 72 64 20 74 6f 20 6c 6f 73 65 2e 20 20 59 |ford to lose. Y|
00000260 6f 75 20 20 73 68 6f 75 6c 64 20 20 66 69 72 73 |ou should firs|
00000270 74 20 74 72 79 20 7c 0d 20 20 20 20 20 20 7c 20 |t try |. | |
00000280 6f 75 74 20 20 74 68 65 20 20 70 72 6f 67 72 61 |out the progra|
00000290 6d 73 20 20 75 73 69 6e 67 20 20 64 69 73 63 73 |ms using discs|
000002a0 20 20 74 68 61 74 20 20 68 61 76 65 20 65 69 74 | that have eit|
000002b0 68 65 72 20 62 65 65 6e 20 7c 0d 20 20 20 20 20 |her been |. |
000002c0 20 7c 20 64 75 70 6c 69 63 61 74 65 64 20 6f 72 | | duplicated or|
000002d0 2c 20 62 65 74 74 65 72 20 73 74 69 6c 6c 2c 20 |, better still, |
000002e0 68 61 76 65 20 6e 6f 74 20 62 65 65 6e 20 75 73 |have not been us|
000002f0 65 64 20 61 74 20 61 6c 6c 2e 20 20 7c 0d 20 20 |ed at all. |. |
00000300 20 20 20 20 2b 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d | +-----------|
00000310 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------|
*
00000330 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2b |---------------+|
00000340 0d 0d 0d 49 6e 20 74 68 69 73 20 6d 6f 64 75 6c |...In this modul|
00000350 65 20 49 20 77 69 6c 6c 20 64 65 73 63 72 69 62 |e I will describ|
00000360 65 20 69 6e 20 64 65 74 61 69 6c 20 6f 6e 65 20 |e in detail one |
00000370 6d 65 74 68 6f 64 20 6f 66 20 70 72 6f 64 75 63 |method of produc|
00000380 69 6e 67 20 63 6f 70 79 2d 0d 70 72 6f 74 65 63 |ing copy-.protec|
00000390 74 65 64 20 73 69 6e 67 6c 65 20 64 65 6e 73 69 |ted single densi|
000003a0 74 79 20 64 69 73 63 73 2e 20 54 68 69 73 20 74 |ty discs. This t|
000003b0 79 70 65 20 6f 66 20 64 69 73 63 20 69 73 20 64 |ype of disc is d|
000003c0 65 73 69 67 6e 65 64 20 74 6f 20 70 72 65 76 65 |esigned to preve|
000003d0 6e 74 0d 6f 74 68 65 72 20 70 65 6f 70 6c 65 20 |nt.other people |
000003e0 73 65 65 69 6e 67 20 68 6f 77 20 79 6f 75 72 20 |seeing how your |
000003f0 70 72 6f 67 72 61 6d 73 20 77 6f 72 6b 20 61 6e |programs work an|
00000400 64 20 74 6f 20 73 74 6f 70 20 74 68 65 6d 20 64 |d to stop them d|
00000410 75 70 6c 69 63 61 74 69 6e 67 0d 74 68 65 20 64 |uplicating.the d|
00000420 69 73 63 2e 20 4d 65 65 74 69 6e 67 20 74 68 65 |isc. Meeting the|
00000430 20 66 69 72 73 74 20 6f 62 6a 65 63 74 69 76 65 | first objective|
00000440 20 69 73 20 72 65 6c 61 74 69 76 65 6c 79 20 65 | is relatively e|
00000450 61 73 79 2e 20 4d 65 65 74 69 6e 67 20 74 68 65 |asy. Meeting the|
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00000470 65 20 69 73 20 76 69 72 74 75 61 6c 6c 79 20 69 |e is virtually i|
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18-09-88/T\DFS06.m0
18-09-88/T\DFS06.m1
18-09-88/T\DFS06.m2
18-09-88/T\DFS06.m4
18-09-88/T\DFS06.m5
.