A thin film semiconductor device has a semiconductor thin film with a film thickness of 200 nm or less. At least one instruction, when executed by the device, causes the device to enter into a wait state associated with a plurality of predefined wait state exit conditions. The current back-flow preventing circuit is constructed from a switching element such as an FET so that the generation of heat in this circuit is suppressed. The second multimedia content consists of the part of the particular multimedia content remaining to be transmitted at the point of time at which the second device requested the continuous provision of the particular multimedia content. The conversion circuit receives a pseudo random number sequence from an output of one of the plural shift registers excluding a last shift register of the series connection, and converts first data to second data using the received pseudo random number sequence.