When attributes are locked they are unavailable for editing and they appear gray in the Attribute Editor and the Channel Box.
To lock a channel in the Channel Box
To lock a channel in the Channel Control menu
The Channel Control Editor appears.
The process of managing attributes in the Locked tab of the Channel Control window is the same as that used in the Keyable tab.
Locked attributes may also be unlocked in the Attribute Editor by right-clicking in the field of the locked attribute.
To unlock a channel in the Channel Box
To unlock a channel in the Channel Control menu
The Channel Control Editor appears.