'Sector structure protections'
Author:Lord Crass (guest: search)
Date: Tue, May 03rd, 2011 @ 00:45 ( . )

When looking at titles that I suspected had this protection, I found a different protection that checks the same sector structure and is also commonly used.

Again, no idea who wrote it or what it's called. It has no identifying text it in. It's a bit simpler as well, it just reads a data and header block length along with the leading and trailing byte before the sync mark, then reads a few more sectors and checks that they match what was previously read. Mostly Mindscape used this one.

Due to its similar nature, this one also gives Vice problems.

Attachments:
1304397901_Mindscape-prot.txt


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'Sector structure protections'
Author:Lord Crass (guest: search)
Date: Wed, May 04th, 2011 @ 22:54 ( . )

Karate Champ (Data East) also uses the same protection check on track 19 that Dolphin's Rune and those others use.

As a kid, I always wondered why I couldn't copy this one...


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'Sector structure protections'
Author:Nate (guest: search)
Date: Thu, May 05th, 2011 @ 02:54 ( . )

On 05/04/2011 @ 22:54, Lord Crass wrote :
Karate Champ (Data East) also uses the same protection check on track 19 that Dolphin's Rune and those others use.
:
: As a kid, I always wondered why I couldn't copy this one...
--



Yeah, that's the reason I got back into reversing these copy protection schemes later in life. You always wondered, "just what is on those disks?"

It's great that you've got the time to analyze all these schemes. I'm a little jealous since I always planned to do that "one of these days".


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'Sector structure protections'
Author:J Achernar (registered user: 36 posts )
Date: Wed, May 04th, 2011 @ 23:34 ( . )

The original of Dolphin's Rune that I have does not appear to use any copy protection. The D64 image works fine in VICE 2.3 (with new CIAs selected) and CCS64, but not VICE 2.2.


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