How to encrypt CAD drawings? Let him just look at it and not modify it?

1. Locate and click the file above CAD, and then click Save As in the pop-up menu.

2. Select the location where you want to save the file in the pop-up window, and then enter the file name.

3. Find and click the tool above, and then click the security option in the drop-down menu.

4. Enter the password according to the prompt, then click OK, enter the password again in the pop-up window, and click OK.

5. Click Save in the graph save as window, find and double-click the saved file.

6. You need a password to open it at this time. If the password is incorrect, you will not be able to access it.