Activate this option to prevent any incoming animation from overwriting channels with driven keys. Maya has special driven keys that link one attribute value to another object attribute. These keys are exclusive to Maya and are not supported by FBX. When this option is active, the Maya FBX Plug-in prevents the disconnection or overwrite of attributes that use driven keys.
If the option is active, the driven keys are protected and no incoming animation is applied to the driven channels.
If the option is not active, the driven keys are discarded and the incoming animation is applied to the driven channels.