Question

which software is used by the proprietary and has closely garded code​

Answer 1

Answer:

military grade software

Explanation:

Answer 2

Ans=Closed source software

Closed source softwareClosed source software (CSS) is opposite to OSS and means the software which uses the proprietary and closely guarded code. Only the original authors of software can access, copy, and alter that software. In a case with closed source software, you are not purchasing the software, but only pay to use it.