So, while the servers are down for maintenance, I was chatting with a friend via Google Chat while listening to some music. The Burning Crusade main title started playing, so I put on my rose-tinted glasses and took a trip down memory lane with my friend. We talked for a good 30-ish minutes on how much fun BC was. This lead to the topic of classic servers and even private servers. I thought Blizzard could test out expansion-themed servers (just 1-3 servers) as an experiment, to see if it was worth it to them financially.
Anyways, we get on the topic of private servers (**NOTE: I HAVE NEVER USED A PRIVATE SERVER**) and how Blizzard will continually try to shut them down, and even go as far as to seek damages. It made sense to me, it's Blizzard's property and they're free to do so, especially when people are making money from private servers. But then that lead me to talk to him about the WoW Model Viewer, since we've been talking about getting into machinima.
So, that leads me to my question: what makes the WoW Model Viewer perfectly fine in the eyes of Blizzard, but not private servers where there is no exchange of money? Both are using Blizzard property for non-profit uses (or at least CAN be used for non-profit), but one is taboo and one is a great tool used by many.
Edit:
Let me clarify, I'm not supporting private servers in any shape, way, or form. Just asking a simple question regarding what does/doesn't violate Blizzard copyright and intellectual property.