I always ran into that same problem with my early maps. Now I use a few different map protectors. When I update one of my maps I change between wich protector I used last in hopes that even if someone does extract the CHK and tries to hex it they might suceed the first time after a long time, then when they try it again on a later version they'll hit the wall wondering why the heck the encryption changed so much.
Incase any are looking here... I'm not listing which ones I use

If anyone out there is looking for a good challangeing map, try either of my Merchants RPG maps, Merchants RPG 2 Champion Edition v4.7 or the Merchants 3 RPG. They're both in the UMS archive, and are reasonably difficult.
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