Well it's possible to turn it off,but remember DON'T EDIT!
How about STOP TELLING EVERYONE HOW TO TURN IT OFF. SO PEOPLE LEARN THEMSELVES.
Yep, it strange, but I agree with Yates.
Few months ago I has no idea how to remove this motherfucker protection. Then I develop my own way how to easily crack it with... Ooops...
I seen program, which add invisible env_message to your map, and you can`t remove it with cs2d editor. Yes, I crack that too, but that idea was good.