Dungeon Master Copy Protection

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catmando
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Dungeon Master Copy Protection

Postby catmando » Fri Sep 06, 2019 3:37 pm

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Zippy
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Re: Dungeon Master Copy Protection

Postby Zippy » Fri Sep 06, 2019 4:34 pm

Quite a few mistakes there...

1. "Enter a word from the manual" type protection wasn't always easy to remove
2. ST/Amiga disks had 80 tracks per side, not 40
3. Rob Northen protection wasn't based on a protected "long track" with no sectors, it was a single protected sector with non-standard data rate within that sector
4. The Copylock serial number calculated from a protected Rob Northen disk wasn't checked within the encrypted Copylock protection code
5. Copylock serial numbers weren't always unique to each individual game
6. CD's and floppy discs don't have a direct 1:1 relationship of pit/land or magnetised/non-magnetised area to a single bit of the stored data

There's more info on the Dungeon Master copy protection here :

http://dmweb.free.fr/?q=node/210

and full details in the files here:

http://dmweb.free.fr/Stuff/ReDMCSB_Release2.7z

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troed
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Re: Dungeon Master Copy Protection

Postby troed » Fri Sep 06, 2019 6:45 pm

thanks Zippy :)

ijor
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Re: Dungeon Master Copy Protection

Postby ijor » Tue Jan 21, 2020 6:33 pm

Sorry for the late follow up. I missed this thread ...

Zippy wrote:Quite a few mistakes there...
3. Rob Northen protection wasn't based on a protected "long track" with no sectors, it was a single protected sector with non-standard data rate within that sector


There is an early Copylock/Rob Northen copy protection, that IIRC is based on a long track. I would need to perform some searches to find out some titles. But of course, the most famous Copylock protection, and the most common by far, is the one you mention with one sector recorded with a different bitrate.

PS: I don't remember for sure if the early protection it's indeed a long track. But I am certain it exist and it is a simpler, not so advanced, protection.
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