DonNews #03 28 января 1999

Интернет

Lecture - Dissemination of programs through an electronic network.

ЎЎЎЎЎЎЎЎЎЎЎЎЎЎЎ LECTURE ЎЎЎЎЎЎЎЎЎЎЎЎЎЎЎ

 (C) Dimon



     Today we'll talk about how
protect your software from
unauthorized dissemination of
using an electronic network, more precisely
help your program to avoid this
uchesti as yet completely
protect your software from
unauthorized rasprostaraneniya
Still can not.

There are three basic ways
software distribution by
electronic network - is using the network
FIDO, with the help of the Internet, and
Finally, the most undesirable for you -
this space your program
permanent storage and, therefore,
free access to it directly from the
FTP sites and WWW pages.

There are several types Fail in
that can transform your fail.

1) Hobeta
The oldest of these types. Was made
for what would be in the sector, following
immediately after faila remained info
about what the actual performance
Fail to have real spektrume, then
Information is taken from 0 to track
floppy disk file and is appended for
Fail. Programs that make this
simple operation exists as to
Spectrum, and on pisyuke and Amigo.
However, until recently, was
problem with long file zahobechivaniem
in 255 sectors in the TR DOS, so
how to create additional file
longest in the 1 sector, but there was
program DTDC, and this problem has disappeared,
so it zahobechivaet file directly in MS
DOS floppy disk.
Protect themselves against it simply elementary -
need to make sector-based boot in
your program.

2) TRD
Is Fail-long 655,535 bytes
then there is the image of a floppy TR DOS,
only less than 159 tracks. Software
Support is both Spectrum and
on pisyuke and Amigo. This thing was
invented in order to copy a floppy disk,
copy-protected format
Hobeta. It is true there is a small
problem for users using
system of Unix, to which I am too,
as a file with a certain method
copy, can not begin there,
where necessary, as well as programs
TRD copying files on a Spectrum
do not copy the file, but only 655,535
bytes from a certain place on the MS DOS
floppy disk, then you know - the result of
on the face - or anything you do not get. I
I know how to get around this glitch, but this
later on.
Protect themselves, too, in principle, an elementary
- Dostatoschno put the protection on the floppy something wrong 
track, and all - Floppy does not read any of that.


3) FDI
Options him tezhe that and TRD archive
but he may, for example, copy IS
DOS diskette, and similar simple
protection. Software support exists
only pisyuke. Special
propagation is not purchased.
Protect themselves too easy - just
put a good defense to a floppy.

4) TD0
Reads any disk, any protection
but, again, less than 159 tracks.
Software support exists only
on pisyuke.
Circumvent protection can also - quite
record of the boot block
log on 159 tracks and useless
will copy it, so none of the
All formats are not supported
advanced track.

5) TDK
Little I know of a recording format. But
In my opinion, no different from TRD.
Software support exists only
on pisyuke.

6) SCL
Recently appeared. Represents
improved format and Hobeta
somewhat similar to the TRD. See how much
on a floppy disk hold files, and the rest
place a floppy disk just does not touch them.
Enough to put protection on kakuyunibud track and floppy disk 
will not read. 

Next, consider the places where they can
send your program.

1) FIDO network. File forwarded
divided into parts of 16384 bytes.
There are several networks
Spectrum:
fido7.zx.spectrum
fido7.spb.speccy
fido7.real.speccy
relcom.comp.speccy
comp.sys.sinclair
In the networks themselves are not anything broken "
forward, since it is forbidden
rules. In principle, transfer of
FIDO can be any Fail, but FDI, TD0 and
TDK can be glued together and bring in
normal form only to pisyuke.
And, you know, send,
For example, totzhe TRD file is very
tiring.

2) Internet network. On it you can send
files of any size, sufficient that
you had e-mail address. But different
server to distribute different quota
overall size of letters, but usually about 100
kilobytes. So if this is so, then you
no luck, and large files, you can not
receive.

3) FTP server and WWW pages. Well here
just freedom for all. From the WWW pages
Broken software is on the site Virtual TR
DOS. On my page only our software, I
I, of course, to cram the page
so much software, all other sites
only envy (more than 250 TRD
archives, which is about 150 megabytes), but
I'm not my husband, but who needs one
apply directly to me.
From the FTP server the most different in
Total broken "software Grodno,
on the Ogre and FTP Point'a.

And so, what conclusion should be drawn from
all of this. To ensure that your
program, if possible, as soon as possible
lasted longer, you must:

1) Place the defense as to 0 lane, so
and the entire disk.
2) to score a floppy disk preferably in full.
3) Be sure to record information on
sector after the 159 tracks, it is desirable
including 163 track.

The first point I think the discussion is not
needs, and a third, like, too, if
do not understand why - read above.
And, behold, the second point, I think we should
particularly to explain.
Since you'll be, I think, to use
expansion of the sector, then, if you
will free the sector on a floppy disk,
quite feasible to move
information with advanced sektorv on
free sector. It's enough to
will alter the boot loader.
It is also very good, if your program
will be 0 to check the correct
Locate all files on diskette
that is, if lacking any
file on a floppy disk or a file
is not where you want them, then log
either will not run, or better yet,
will kill on a diskette.

So read and do for themselves
conclusions. I just want to note that,
For example, ZX Format 7, which was a floppy disk
completely clogged up to 163 tracks, and not
hit the Internet. These are the things here.