Re: Simplest Dongle Method? Making a file uncopyable on CD?
Re: Simplest Dongle Method? Making a file uncopyable on CD?
- Subject: Re: Simplest Dongle Method? Making a file uncopyable on CD?
- From: John Stiles <email@hidden>
- Date: Mon, 26 Jun 2006 10:18:28 -0700
There's always "SecuROM." They recently introduced a Mac version of
their CD-based copy protection scheme.
SecuROM requires that the user insert their originally-purchased CD
to run the software.
I don't know the internal workings but I believe they do something
along the lines of damaging a sector or hiding bits in areas outside
of the normal file system. They also encrypt the application to avoid
trivial "nop" hacks.
I haven't used it myself, but I heard that it was released several
months ago.
On Jun 26, 2006, at 9:29 AM, Michael Ash wrote:
On 6/26/06, shin kurokawa <email@hidden> wrote:
I remember being able to do something similar to this during
the Golden Age of Floppies and Tapes by intentionally 'damaging'
the file header(s), but I haven't done anything cheezy as that
in years and I have no idea how such files interact with today's
Disk Utility and various other tools that can dupe CDs.
Trying to make bits uncopyable is like trying to make water not wet.
If your file can be read, it can be copied, and there's no way to even
make it hard.
As I understand it, the Golden Age of Floppies tricks were done by
just damaging part of the physical disk and then making sure that
sector was unreadable. When copying the disk, the copy program would
either fail or write some sort of readable sector. This was not an
unreadable file, but rather an actual physical change in the media.
Even if something were possible in CDs, you probably couldn't get it
mass produced unless you are a very big customer indeed. You may be
able to do something vaguely similar by intentionally corrupting the
filesystem, but this won't prevent anybody from just making a disk
image or doing a bit-for-bit copy of the disc.
Mike
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Cocoa-dev mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
40blizzard.com
This email sent to email@hidden
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Cocoa-dev mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden