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CAD tip CAD tip # 2649:

Question CAD 
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Q - question

How to protect AutoCAD drawing content with a password?

A - answer AutoCAD (up to version 2002) doesn't support password protection of DWG files. You can use add-on utilities like CADlock or CADVault ( to protect your drawing. CADVault can also password-protect changes (editing), printing, individual layers or objects...

Alternatively, the DWF publishing format (since V6) supports password protection.

AutoCAD 2004 and higher offers password protection (and encrypting) of saved DWG and DWF files (just read-passwords).

100% *  CAD 
31.10.2002    44700×   FAQ  

See also:
Tip 12136:Security settings for Inventor data files and add-on applications.
Tip 11868:Open just a part of a DWG drawing - layers, views.
Tip 10329:Easily share your Fusion 360 design.
Tip 9757:How to remove the EDU stamp "Created in an educational version" from a DWG drawing file?
Tip 9661:Where to find the Portable license utility (PLU) in AutoCAD 2010, 2012, 2014 and higher?

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Add .CIT raster format support to AutoCAD and Map and Civil 3D
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