Locking programs cost $$$. DWG does not have a locking capability.
Honestly, locking serves no purpose other than to inconvenience others.
Anything that can be printed can be reproduced even if it means manually
redrawing from scratch. Best alternate choice is dwf files which are
locked as far as original content, but can be marked up.
I remembered it's name! :-)) And, it's not a lisp, it's a vlx.
Here it is:
Once you use it on a drawing (or selection) it converts it in to a
minsert block. If i remember correctly (i don't even have ACAD
installed at home :-)) ) you can add to it, but you can't do anything
to the original (might be mistaken). Hope it helps.
There is a way of exploding those minsert blocks (if you accidentally
do it on a original) but how many users know how? :-))
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