Knowledge Vampire
A Knowledge Vampire extracts unique information, knowledge and practice wisdom that form the body of knowledge resulting from another's intellectual and scholarly pursuits. They do this because their rise in success, social currency or professional status relies on preserving an illusion of intellectual prowess in that and other disciplines to maintain a competitive advantage.

Knowledge Vampires are mostly (but not always) unaware they are extracting knowledge from another person. Like Energy Vampires, who employ traits along the narcissism behaviour spectrum to recruit an unending supply of emotional energy, Knowledge Vampires are able to retain a supply of targeted information through grooming methods that build trust and guarantee attention on their knowledge acquisition needs.

Knowledge Vampires cannot be deterred by garlic or crucifixes but can be with contracts and written agreements that preserve your intellectual property.
I've been bitten by a Knowledge Vampire who posed as a trusted colleague and is now passing my intellectual property off as their own. I wish I had eaten more garlic.