I don't understand how it is copyright infringement. From the official ruling it seems they hang their hat on the limitation that "third party software designed to modify the WoW experience" is prohibited under the copyright license.

So does that mean that anybody can put any limitation in the copyright license? "You cannot listen to this while drunk?" "You can only read this upside down?" "You cannot listen to iTunes and play Team Fortress 2?"

Now if Glider modifies the RAM functions of WoW (derivative work), that is one thing, but that is not what the court pegs its ruling on.