Patent ID: 7334051
Filing Date: 2008-02-19
Classification: G06Q,G11B,H04N

Abstract:
1. A data distribution system including: a distribution center apparatus for dividing digital content data into parts in many frequency bands, converting said divided part of digital content data included in each of said many frequency bands into a piece of encoded data composed of many compressed blocks each having a predetermined length unit and being constituted by at least bit distribution information, normalized data and quantized data, and transmitting said encoded data in such a manner as to superimpose, if an empty portion exists in each of said many blocks, a part or all of an identifier for identifying a provider of said digital content data onto said empty portion, wherein the predetermined length unit is set as a function of time characteristics and a frequency distribution of a supplied signal; and a terminal apparatus connected to said distribution center apparatus through a predetermined communication line, said terminal apparatus including recording means for recording said digital content data provided as said encoded data from said distribution center apparatus to a recording medium loaded in said terminal apparatus, said data distribution system comprising: reading means for sequentially reading the blocked encoded data from said recording medium loaded in said terminal apparatus; first discriminating means for discriminating whether each block of said encoded data read by said reading means has said empty portion; extracting means for extracting data of said empty portion from said each block found as having said empty portion by said first discriminating means; demodulating means for demodulating said identifier for identifying said provider on the basis of said data extracted by said extracting means; second discriminating means for discriminating whether said digital content data, which are the encoded data read from said recording medium loaded in said terminal apparatus, are those provided by said distribution center apparatus, which is legitimate, on the basis of said identifier for identifying said provider demodulated by said demodulating means; and control means for performing predetermined control processing if said digital content data, which are said encoded data read from said recording medium loaded in said terminal apparatus, are found provided from said legitimate distribution center apparatus.