There are is no encryption leveled on any of the .PDBs linked to from that site - with the possible exception of the Message as that was a special case that a few people worked very hard towards opening to the B+ community.

EDIT:
In terms of OliveTree modules, we would definitely be better in going to them directly. I've got a number of contacts there and will not have a problem with opening this discussion with them. However, the inclusion of Olive Tree modules would mean that some type of licensing mechanism would need to be built into Katana. I'm not sure that this falls under the original scope of the project, and this may introduce some other complexities.