LAYLCK command
Locks the layer of a selected entity.

Icon:
Description
Opens the Layers panel to display it in the current workspace. The Layers panel appears at the same size and location that it did before it was closed or collapsed. Like any other dockable panel, the Layers panel can be either floating, docked or stacked.
Method
Lock the layer of a selected entity to prevent entities on that layer from being edited.
You are prompted:
Select an entity on the layer to be locked
Select an entity on the layer you want to lock.
The Command line indicates which layers have been locked:
- This layer has been locked: LayerName1
- This layer has been locked: LayerName2
Entities on locked layers are faded by default. You can change layer fading with the LAYLOCKFADECTL system variable.