Raid-DP Vs Raid-6

Hello Everyone,

Could someone shed some light as to how the 2nd parity bit is calculated for both RAID-DP and RAID-6. Is it the same?
I understand ,the only difference between RAID-6 and RAID-DP is that, the 2nd parity bit is distributed in raid-6 unlike Raid-Dp. But how is the 2nd parity bit calculated in both the case?