18:0418:04, 21 November 2011diffhist−243
DVD+RW
eleted: dubious claim NOT supported by citation given (citation only speculated that it merely 'may' have been the raison d'être - hardly conclusive).
17:0517:05, 21 November 2011diffhist−1,718
Hi-MD
→Criticism: Deleted per discussion. There is no evidence that the audio is encrypted. Indeed vanilla ATRAC requires no processing on playback.