Download Festival is a British rock festival, held annually at Donington Park in Leicestershire, England, since 2003. It is the most popular British summer rock and heavy metal festival and has hosted some of the biggest names in rock and metal including Slipknot, Saxon, Black Sabbath, Metallica, Rammstein, Iron Maiden, Slayer, Muse, Motörhead, Aerosmith, Linkin Park, AC/DC, Def Leppard, Kiss, Judas Priest, Status Quo, Motley Crue, Journey, ZZ Top, Whitesnake, Thin Lizzy, and Guns N' Roses. One innovation at the 2015 festival was the massive technological surveillance by police in conjunction with festival organizers Live Nation UK. RFID wristbands and facial recognition technology was used to compare visual scans of attendees against a European criminal database.