Unlike some games such as "Second Life", in-game currency is not freely convertible with real world currency. Players may only buy specific in-game items (such as the Pilot License Extension (PLEX), a token worth 30 days of game time) from CCP with real-world currency. The player can then sell the items on the in-game market for ISK (game currency). The reverse process, selling in-game currency or items for real-world money, is prohibited. The developers' reasoning for this policy, as related by a CCP representative at Fanfest 2010, is that free interchange of currency causes in-game banking to fall under the same regulatory domain as real-world banking. CCP would rather not place this restriction on in-game behavior, due both to the difficulty of regulatory enforcement and the desire to allow players to create illegitimate in-game banks or Ponzi schemes if they wish to do so.