iTunes XML (SD)
XML is a work around that tricks your computer into having a disc in the drive when it doesn't. XML codes will redeem SD in I-Tunes, but most I-Tunes users don't mind the downgrade as it compares to HD on Vudu and Fandango.
If you are new to XML as an option for expanding your I-Tunes library, please watch the video included in this description. At the end of the video, please click on the "show more" button under the actual You tube video here. This will give you the links needed to download the required files in order to trick your computer and accept the codes.