Mandatory what? It's not mandatory. If you don't own a TV and don't stream Live shows on iPlayer (BBC's streaming service), you don't need a TV license. Also as far as I know, you don't need a radio license. Checked wikipedia on that, abolished in 1971 for radios. If you watch BBC iPlayer tv post-broadcast time, you don't need a license. Anyway, I'll take the BBC any day over most American ad-infested overpriced channels.