Digital signal transmitting methods, digital signal receiving apparatus, and recording media

摘要

A digital signal transmitting method, a digital signal receiving apparatus (40), and a recording medium (101) ensure the security of fee-charged software information. When an image providing predetermined services is transmitted, a band-compression coded digital video signal is subjected to first-encryption processing and then the digital signal is subjected to further encryption processing and transmitted. Therefore, double security can be added to the video signal and a digital signal transmitting method of more firmly ensured security can be realized.