In June 2002, Mysterio signed with World Wrestling Entertainment (WWE), and promos that hyped his debut began airing. The "Jr." was dropped from his name and was billed simply as Rey Mysterio. At the insistence of Vince McMahon, Mysterio agreed to wear his mask again. While this angered lucha libre fans in Mexico as it violated tradition, Mysterio did receive permission from an official lucha libre commission to wear his mask again, as he had not lost his mask in a traditional mask vs. mask match. WWE has normally censored footage of Mysterio being unmasked in WCW for kayfabe-based reasons. However, when WWE Classics on Demand rebroadcast WCW Sin in April 2013, a match featuring Mysterio unmasked was left intact.