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A few propose of this operating system security such as multiprogramming had been introduced for the protection need..Some of purpose is for memory protection, means that prevents from corrupting the memory of another process running on the same computer and same time but we must allert with the method protection of memory.
There are seven of method :

• Fence
• Relocation
• Paging
• Segmentation
• Base/bound register
• tagged architecture
• paging combined with segmentation

Besides that, we must protecting general object by using file protection, group protection, access control limitation,permission, authentication and so on. Below is general object protection :

1. Memory
2. File/Data set on an auxiliary storage device
3. Program Executing in memory
4. A directory file
5. Hardware device