Region code hacks for Japanese decks have been performed to support playback of US titles. The last film available was 20th Century Fox's "I, Robot". This title was a surprise to many as there were no prior announcements nor any indication that the title was available. It was originally available only on JVC's D-VHS store in late 2004 and no other distributor had it (not even Fox itself). A couple of weeks later they started trickling out to more distributors after much delay and confusion about its existence. "Alien vs. Predator" was announced to retailers as also being released on the same day as "I, Robot", but Fox later announced that "Alien vs. Predator" was never shipped to retailers. Most tapes have built-in copy protection mechanism (DTCP, also known as "5c") (copy never) that disables copying via FireWire. HDNet productions and 2929 Entertainment via Magnolia Entertainment did provide some of their original content on D-VHS but without copy protection. Many of the tapes have an introduction by owner Mark Cuban encouraging the viewer to make copies of the program in order to help distribute them. Additional tracks may be included on D-Theater in other sound formats such as DTS. However, only the newest D-VHS players like JVC HM-DH40000, HM-DH5U, HM-DT100U, and Marantz MV-8300 include alternate audio track capabilities.