HBO IS non-exclusive 

Here's why,

http://store.hbo.com/sm-the-sopranos-season-6-part-1-blue-ray-dvdpi-2568739.html

and,

http://store.hbo.com/product/index.jsp?productId=2568738

So there you have an HBO Blu-ray release and an HBO HD-DVD release. STOP CHANGING IT TO EXCLUSIVE. IT WILL BE CHANGED BACK!