You mean the protocol? Well it can't be sold as the standard is open and there is (as far as I know) no reference implementation which include special/exclusive

You mean the protocol? Well it can't be sold as the standard is open and there is (as far as I know) no reference implementation which include special/exclusive features which might have some intrinsic IP value. I think the extensibility of the protocol together with some proprietary features layered on top might have value though. I can't think of an example at the moment.