17.20 Secondary Liability-Vicarious Infringement-Elements and Burden of Proof is a legal concept that governs the liability of individuals or entities for acts of copyright infringement that are not necessarily committed directly by them. The key elements of vicarious liability include control and a direct financial benefit from the infringement. The burden of proof is on the copyright holder to prove that the infringed had control over the infringing activity and that the infringed obtained a financial benefit from the infringement. There are two types of 17.20 Secondary Liability-Vicarious Infringement-Elements and Burden of Proof: contributory infringement and vicarious infringement. Contributory infringement is when an individual or entity has knowledge of the infringement and materially contributes to it. Vicarious infringement is when an individual or entity has control over the infringing activity and receives a direct financial benefit from it.