But all that does is makes it unexplodable. It's still editable. And all you have to do is open the block in the editor, BEDIT, and change it back to "Allow Exploding" and then it can be exploded again.

 

There really is no way to protect drawings. If someone comes up with a way to lock a drawing, someone else will come up with a way to unlock it. That's just the way it goes.

 

Just keep good records of what you sent, when you sent it and who you sent it to. Sending zip files via email is a great way to keep track of where your drawings are going. Also, include a disclaimer with the drawings which states that any changes made to them without your consent will violate whatever contract you have and void any guarantees or warantees, expressed or implied, contained within the drawings. Have your lawyer write something up.

 

But, if you are contracted to provide dwg's to your client, that's what you have to provide. You should not be trying to lock your drawings.