Duel Terminal 1 released on January 29, 2010, reprinting many old cards while also introducing new strategies. But not all the new cards within the set were deemed tournament legal for the purposes of SJC - Edison or other SJC events at the time. Given the limited nature of Duel Terminal machines, Konami's official policy was as follows:
"New DUEL TERMINAL cards are not tournament legal until they are available through some other method, such as inclusion in a Hidden Arsenal set or some other form of Booster Pack or Deck" [REF].
For a complete list of cards first introduced in DT01 that are NOT LEGAL for Edison Format, click HERE.