A method for recoding data on an optical medium such as DVD. The method includes receiving main data from a data source, determining a plurality of data frame values in response to the main data, inverting at least one selected bit in at least one of the data frame values to generate a plurality of encoded...http://www.google.co.uk/patents/US6842522?utm_source=gb-gplus-sharePatent US6842522 - Secure digital video disk and player
