Well first of all, map is protected, secondly if it's protected it means that you don't have the rights to open it, no one will ever deprotect a map that isn't his.
And why do you need to change the LS anyway? Don't like? I think it's great.
This is an epic fail with the thread... Opening DotA haha, id like to see that... Although someone already tried and succeeded.
P.S. If you'd created a great map, would you like all people using it as a basis for their own maps? Think not. Enjoy DotA as it is and its Loading Screen.