Patent ID: 7900062
Filing Date: 2011-03-01
Classification: G06F,H04L,Y10S

Abstract:
1. A data generating device for generating data to be written to a recording medium together with a digital work, comprising: an obtaining unit operable to obtain the digital work; a filling capacity calculating unit operable to calculate a data size based on free space on the recording medium becoming a predetermined amount or less than a predetermined amount; a filling content generating unit operable to generate filling content and a random number to be recorded to the recording medium together with the digital work, the filling content having the data size calculated by said filling capacity calculating unit and the random number being included in the filling content; a header information generating unit operable to generate record digest values, each of which is generated from a different one of a plurality of data blocks constituting the digital work and a plurality of data blocks constituting the filling content; a signature information generating unit operable to generate signature data based on a number of the record digest values; and a writing unit operable to write, to the recording medium, at least the digital work, the filling content, the number of the record digest values and the signature data.