If you want to encrypt files and CAD drawings in large quantities, you really need to pay for third-party file encryption software.
This encryption software can encrypt daily office, picture design, drawing design, three-dimensional design, audio-visual editing, text editing, electronic and electrical design, simulation calculation, programming development, single chip microcomputer development, enterprise management, browser, compression software and so on.
At present, the mature file encryption software on the market includes domain shield, security enterprise, network management, Zhongke security enterprise, etc., which have been done for a long time. You can choose according to the effect you want to achieve.