From a question posed by a customer:
Question: Is
there a way to lock and password protect drawing layers so I can email them to
someone and them not be able to change the drawing. Also is there a easy and
preferably “free” way to make a drawing into a pdf. I use primopdf for making
calcs or lists into pdf’s but I haven’t figured a way to make a large document
sheet pdf with that program.
Answer: In AutoCAD 2007
and newer you can Plot to a PDF in the plot command, Choose the DWG to PDF
driver
Answer #2: The best way to
protect layers is to print a DWF of the drawing. You can then choose what abilities to edit the user has.

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