A digital rights management system for distribution of digital content such as audio or video uses a token passing scheme to enhance security of the content from unauthorized access and use, including access by unauthorized players. The system may switch between control architectures or vary gain coefficients used in a control loop to control the device. A weighing signal wire of the weighing sensor and a speed measuring signal wire of the speed measuring sensor are connected with the accumulator. The front surface includes a connection area. In a second step, the inferred generic answers ) can be used to restrict the original query to objects which have an appropriate structure.