Abstract: A Pay-Per-Patent-Proof (PPPP) system for enables the user, for example an inventor, to submits a patent search application, which includes a description of the invention, for the purpose of assessing the patentability of an invention, and assessing the risk of patent infringement by implementation of the invention. The application is checked by a patent researcher. If a prior publication of the invention is provided, and as a result, the invention is not patentable, the user is charged for the patent search. If a prior publication is not provided, the user will not be charged. The billing sum can be dependent on the patent search and assessment parameters such as: response time; duration of search time in databaess relevant to the field of the invention; databases necessary for the search; and time of providing results after completion of the search and the assessment.