„Digital Copy:”. Amazon.com. Архивирано из оригинала 2010-06-20. г. „The Digital Copy on The Dark Knight, for example, expires on December 9, 2009, one year after the DVD/Blu-ray was first released.”
Jon Healey (29. 11. 2006). „Wal-Mart's not-so-super downloads”. Los Angeles Times. „So from the perspective of the studios and federal officials, consumers have to pay for the privilege of doing the sorts of things with DVDs that they're accustomed to doing with CDs (and LPs and cassettes).”CS1 одржавање: Формат датума (веза)
sonypictures.com
partners.sonypictures.com
„Frequently Asked Questions”. Sony Pictures. SONY. Архивирано из оригинала 2008-05-11. г. „The complimentary Unlock Code must be redeemed by the date printed on the insert included in the disc packaging.”
„Digital Copy:”. Amazon.com. Архивирано из оригинала 2010-06-20. г. „The Digital Copy on The Dark Knight, for example, expires on December 9, 2009, one year after the DVD/Blu-ray was first released.”
„Frequently Asked Questions”. Sony Pictures. SONY. Архивирано из оригинала 2008-05-11. г. „The complimentary Unlock Code must be redeemed by the date printed on the insert included in the disc packaging.”