1. It is recommended that you use the Common File. You can use this software to create a CAD electronic drawing file template. You can save the electronic drawing as "data type" instead of "link type" as required, so that the electronic drawing can only be opened through "common file". You can search for this software download on Baidu.

2. If your computer itself is confidential, in order to save data space, it is ok to save it as a "link type".

3. There is no completely confidential method. Even WINDOWS has vulnerabilities, not to mention the software installed on WINDOWS. Secrecy is for ordinary people, just like a security door. Experts want to steal from you, and any security door is useless.