A rolling code transmitter is useful in a security system for providing secure encrypted RF transmission comprising an interleaved trinary bit fixed code and rolling code. 0% and which have a compression strength of from 39 to 98 Nmm2. A saving flag setting section sets a saving flag, the saving flag specifying whether to permit or prohibit the receiving terminal to save the content after the receiving terminal receives and displays the content. For example, heat can be supplied by laser irradiation in the IR region of the electromagnetic spectrum.