Sure there is, it's called "licensing". Licenses cost a lot of money, and are usually sold by the seat (per install) and for specific periods of time (usually 1 year). They are not licensed to release Havok's behavior tools, they are only licensed to use them. Spot on, this is exactly why we won't see a tool from Bethesda to work on Behavior graphs. The thing we have to realise is the files we have access to aren't even part of Bethesda's workflow for editing actor behavior, they are the game readable output from HBT. If Bethesda needed to make changes to a character (the dragon mounts from the game jam for example) they would have simply backed up the old dragon .hkx files, reopened the dragonproject.hkp from their development server, made the changes and generated the files for the game to read using their own custom compression/conversion/whatever. Here is a screenshot from the HBT project export window so you get an idea of what I am talking about: http://i.imgur.com/3G5o8.png Note: I downloaded this HBT version from the Havok website in '09 when they were released with the first iteration of the free Havok Content Tools. I can't provide a link as it was taken down sometime in 2010. Now it may be possible if we are all willing to spend some money; to get a non commercial license to the current iteration of HBT for use by Nexus members. . . But if we did we would still need some way of accessing Bethesda's project files as we could not build game readable behaviors without them. And as far as them making it difficult for us, I am certain that was never part of their motivation, without licensing Havok's middleware I bet we would have missed out on a heap of great content, from the Dragons themselves all the way through melee kill moves down to inverse kinematics (the system that orients characters feet on inclined terrain, more realistically than Oblivion/Fallout 3.) and for me those features would have been sorely missed.