The general idea of a map protector is to damage a map file so it can no longer be loaded into World Editor. World Editor
uses a lot of files and headers that Warcraft III does not, so you can safely delete them and still play the map. On
another note, the necessary information for Warcraft III will always be there, and can be accessed by people who are
knowledgeable about map protectors. Still though, a map protector will render your map useless to the average person.
Protecting a map keeps people online from making changes in their favor and re-releasing the map. Some people have
been known to open maps and seriously rig the game in their favor. Often times, its been a hero with some insane skill.
Protecting a map keeps people from editing your map, and claiming it as their own. Currently on battlenet, there many
mauls and DOTA maps that all look the same with different authors. Protecting a map will help against that.
Many of the map protectors available make the overall file size smaller. This is good for battlenet downloads, or hosting
a map on one of the download sites.
No matter how well you protect a map, there are people who can open it. The bottom line is, if Warcraft can read the
map, anyone can if they know how. As there are map protectors available for download, so are scripts for unprotecting them.
Even if you delete the GUI (graphical user interface) triggers from a map, the JASS format triggers are still there.
Other people cannot learn from your map, thus hindering map development.
People sometimes lose their original map, or save over it with the protected map.