Alright, well, here's my two cents about protecting maps.
Firstly; protecting a map ONLY prevents newbies from learning from it. Anyone who wants to hack it or actually cares that much can easily unprotect it.
Secondly; why is everyone so god damn concerned about credit? What does it matter that much who made the map, in all honesty... if YOU made a good map, whether or not it says it was created by Fredfredburgers shouldn't matter, as long as you see it on battle.net that should give you some pride. But if you really care about credit, use the author protector thingy instead of the map protector.
Thirdly; I don't believe that someone is going to come along and make hacked versions of your map unless it gets really popular. Just encourage people to only play the official versions hosted by you or your bot, or found on a site you specify.
Personally, I hate map protection, and think it is a blight on the warcraft 3 mapping community. How is any new mapper supposed to learn from others except by specific tutorials (generally not covering the exact thing you're looking for) or hours and hours of trial and error.
Also, people *should* be able to make minor modifications to your map if they want, IMO! I wanted to play Kyx's Ice Trolls with my friend, but on the same team, just surviving against nature rather than team vs team. However, the map ends when one team dies; that's not how we wanted to play it, but that's how it was made. I figured I'd load it up and change that, just for personal use as a cooperative survival game. The map was protected, and I didn't feel like it was worth it to go download a map deprotector and go through all that just to play this map.
I'm currently working on a map, and when it's finished, it''s going to be unprotected, organized, and documented, with easy configuration and explanations, and other mappers that I see do the same I hold a lot more respect for than someone who made an easy to make, unoriginal 1-hour map and protected it for no reason.
EDIT: oops, I didn''t realize this thread was already dead and ignored, I'm sorry guys ;(