LOCKUP - Drawing Lock
Sometimes a designer sends drawings to other people, but doesn't want others to modify the drawings. The "Drawing Lock" function can turn the drawing into a whole block. You can't explode it or modify the objects of the original drawing. It is a good way to prevent others from modifying the drawing.
Once the command is started, the follow wizard will be displayed:
Select objects: Select all the objects in the current drawing to be locked and press Enter.