| 摘要 |
<p>A method of recording digital content data onto an AVDDM (Audio Visual Data Distributable Medium) (32) such as a compact disc. The method comprises: assigning (314) a unique identifier (36) to the AVDDM (32); using the unique identifier (36) to create (318) a plurality of data errors in and/or format variations of the digital content data (22) unique to that AVDDM; and recording (328, 330) the digital content data incorporating the data errors and/or format variations onto the AVDDM (32). The data errors and/or format variations are stored in a copyright protection map (44) which is unique for every AVDDM (32). An AVDDM produced by this method is read by combining the unique copyright protection map (44) with the copyright protected data to form the original digital data content.</p> |
