Forgotten restriction passwor

These are user-to-user forums, you are not talking to Apple here.

If you are referring to the password for Settings > General > Restrictions on your iOS device ? If so then was it on it when you last backed up ? If not then you can restore to that backup and it should be removed. If it was on the device when you last backed up then the only way to remove it is to reset the device back to factory defaults and you can then re-sync your content back it - you won't be able to restore to the backup as that will keep the code in place.

If you are referring to something else ... ?