Digital signal recording/reproducing apparatus

摘要

A digital signal recording apparatus (700) is disclosed, which is capable of protecting the copyright of the analog input information encoded into a first digital signal in a recording medium. A second digital signal encrypted based on the key information and the input analog signal encrypted based on the key information are converted into a second digital signal and encrypted, and the resulting signal is selectively recorded in a recording medium (701). The digital signal recording apparatus further comprises a circuit (709) for encrypting the digital signal converted from the input analog signal with a key obtained by a predetermined calculation of the key information according to a scheme similar to the second digital signal protection scheme through a digital interface (720), and a signal recording circuit (703a) for recording the key information and the encrypted digital signal in a recording medium (701).