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Why does opening 20 19cad always display security signature?
What you are talking about is why opening 20 19cad always displays signatures with invalid security. The reason why your software settings are incorrect.

Specific solutions: ① You can open the CAD drawing first, or you can open the CAD.

② Click the right mouse button in the blank space to pop up a shortcut dialog box, and click "Options".

③ Enter the main interface of "Options: Dialog Box". In the main menu bar, click the "System" option to enter the system settings dialog box.

④ Under the "System" column, click "Security Options" in the lower right corner.

⑤ In the "Security Options" dialog box, under the "Security Level" column, drag to "Close" at the bottom.

6 OK, apply, ok, and then open it.

CAD refers to the technology of making and simulating physical design with computer software to show the appearance, structure, color, texture and other characteristics of newly developed goods. The earliest application of CAD was in automobile manufacturing, aerospace and electronic industry production of large companies.