Patent ID: 8526281
Filing Date: 2013-09-03
Classification: G06F,G11B,H04N

Abstract:
1. An information recording method for recording downloaded data, downloaded from a server and received by an information terminal device, on a recordable optical disc by means of a recording apparatus with which the information terminal device is equipped, and thereby providing an information recording medium reproducible by a reproducing apparatus for a prescribed playback-only optical disc, the downloaded data comprising control information including a content encryption key and content information including data encrypted using the encryption key, the information recording method comprising: a first step of recording the content information in a first prescribed position on the recordable optical disc; a second step of recording the control information in a second prescribed position on the recordable optical disc, after the first step; the first step having a substep of selecting a shift value for shifting the first prescribed position within a prescribed range with respect to physical addresses of an area in which the content information is recorded in the playback-only optical disc, a substep of temporarily storing the selected shift value in the information terminal device, and a substep of recording the content information in the first prescribed position determined by the selected shift value; the second step determining the second prescribed position as a position shifted by an amount identical to the temporarily stored shift value with respect to physical addresses of an area in which the control information is recorded in the playback-only optical disc, and recording the control information in the second prescribed position; and a step of deleting the temporarily stored shift value after the optical disc is removed from the recording apparatus once the first step of recording has started.