I am looking for a reliable way to lock drawings in AutoCad. I provide electrical panel drawings to fabrication shops and would like to find a way to restrict what the shops are able to do with the electronic copies of the drawings. I would like to prevent cutting and pasting of my custom details into other drawings or reusing my drawings for other projects.
So far I have had a hard time figuring out how to prevent unauthorized use. I have read about the signature features on AutoCad but that only shows the drawing has been modified but I cannot find a way to "Lock" a drawing.
I am using AutoCad 7 for the design.