Original: Because an early copy of the album appeared on the New York Times website, Colour It In became available to download exclusively from iTunes on 16 December, before its physical release on 14 May, in an effort to combat the leak.
Simplified: Because the album had been leaked, or accidentally put, on the internet, 'Colour It In' became available to download exclusively from iTunes on 17 April before its release on 14 May.