Implementation of security is essential to ensure the system is not interrupted and disturbed. Protection and security of the hardware and operating system are equally important. The operating system is only one small part of all software in a system.
Table below is an example of access matrix object :
Conditions that can cause an object worth the “Write” without having to read first is when the file is in print, because the file is printed when the machine does not need to read the document first, but immediately released the results of the output files to the paper.
Source :
alisran 