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How to encrypt CAD paper
1, open the drawing, click the Tools menu, and then find the option; Of course, you can also directly enter its shortcut key "op";

2. In the pop-up options dialog box, switch to open the save bar, and then click the arrow to find the security option;

3. In the pop-up "Security Options", in the "Password" column, enter the password to be set for the graphic file;

4. When the password setting completion point is confirmed, you will be prompted to enter the password again; (The password set at this time should be the same as that set in the fourth step);

5. After returning to the main options menu, click OK. If you click Save at this time, a dialog box will be displayed. Please remember to save the version indicated above before the password takes effect;

Design skills:

Before setting passwords for drawings, you must make a password setting table to distinguish the opening passwords between drawings, otherwise you may forget the passwords and the drawings will never be opened.