Summercad

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SmartLock
Trial version
SmartLock: Secure Your AutoCAD Designs Effectively
Windows
SmartLock - CAD Batch Lock (Type B)
Trial version
SmartLock-B: Secure Your AutoCAD Designs with Ease
Windows
DeDynamicBlock
Free
Convert dynamic block in the drawing to static block, and removes other dynamic states in blocks.
Windows
SmartSignSafety Visual Digital Signature For AutoCAD
Trial version
Secure Your CAD Drawings With Visual Digital Signatures
Windows
Non-deletableWatermark
Free
Add Permanent, Non-Deletable Watermarks to AutoCAD Drawings
Windows