Summercad

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SmartLock
Trial version
Secure your designs by locking AutoCAD DWG file and protect intellectual property.
Windows
SmartSignSafety Visual Digital Signature For AutoCAD
Trial version
Protect your CAD drawing with visual digital signature.
Windows
DeDynamicBlock
Free
Convert dynamic block in the drawing to static block, and removes other dynamic states in blocks.
Windows
SmartLock - CAD Batch Lock (Type B)
Trial version
Protect your drawing designs from unauthorized modifying or copying.
Windows
Non-deletableWatermark
Free
Draw a non-deletable watermark in AutoCAD, and it will never be deleted.
Windows