What software are you looking for ?
A powerful and fast dwg tools, Protecting drawing file, Keep others from modifying/copying your design. DWGLock is a stand-alone application, no AutoCAD required; Supports AutoCAD R2.9 thru 2009 drawings. Features: Powerful encryption capabilities, secure Maximize security for the entities in the drawing, they can not copy nor change it.Say No to any arbitrary use of your designs; .....