Use English please.

The short answer is: there's no way to protect your map from a professional mapper. Or just as somebody in Internet said: 'You want to protect your map? Then never release your map!'

VMEX, most popular map decompiler, won't decompile your map if your map contains any entity with key 'no_decomp' set to '1'. But there're loads of hacked/cracked copies of VMEX which just don't care about this key. Actually, I can write my own decompiler if you find a way to defeat VMEX.

You can only try to make decompiling as difficult as you can:

1. Set 'no_decomp' to '1', at least no noob will be able to create a '_final_pro_megaultra_remix_2012_fix' of your map;

2. Use custom textures/models, so cracker will have to get them first using Pakrat. If you don't wan't to use custom textures because of their size, then just use custom VMT-files;

3. Put all important one-type logic entities in the one point, so they will look just one entity in Hammer. You can also put them inside the wall/floor so that they won't strike cracker's eye;

4. Hammer and CS:S have different points of view on how entities should be connected through I/O system. There're some ways to make logical connections which will be displayed as broken in Hammer, but actually they will work in game. Cracker may think that these connections are broken and there's nothing to investigate;

5. Entities can be spawned, deleted and teleported in-game. Use this ability to dynamically create and move entities in the places they should be, this will puzzle decompiling;

6. Let's pretend you have created some complex system which you don't want to be stolen, say a vehicle with all entities to control it and players view. So you have a model of this car, some buttons and logic entities around it. Select one important logic entity and put it far away from the car, on the other side of map. If cracker tries to select the car and all entites around it, he will not select this one important entity. He we'll have to understand each entity to find out what is missing. If I was a cracker, I'd rather make my own vehicle than trying to understand how yours one works.

These are most common tricks.

THX