Can anyone steal your knowledge?
In my understanding of knowledge, i.e., a complex linkage between context, information, personal frameworks and social mediation; it can never be stolen. Sure you may have your ideas copied, your information and documentation purloined, your opinions replicated with attributation, but it is just not possible to duplicate your 'thought engine', your unique perspective, reverse-engineer your experience or your ability to make new and more valuable connections.
These abilities / qualities help to set knowledge apart from information and data.