Once you unlock a channel or program, ALL blocked channels and programs are unlocked until you:
Power receiver off, then on again
Manually turn Parental Controls back on:
You can also set up a Purchase PIN that will allow you to control access to On Demand℠ and Pay-Per-View. To set up a Purchase PIN, select Set Purchase PIN from the Parental Controls Menu. Previously set up PINs will remain the same. If you have not previously set up a PIN, there may be a default PIN of 0000.