Patent infringement occurs when someone violates the rights of a patent owner without their consent or license. It may involve third-party use of the patented invention. Patent infringement cases usually focus on two main aspects: the patented invention and the evidence presented to the court. The courts interpret the patented invention based on the patent elements, including claims and descriptions. The patent owner bears the burden of proving patent infringement, either literally or equivalently, as the patent gives them the right to prevent others from practicing the invention.