Mapped Space is virtual memory that has been mapped to a specific virtual address (or range of virtual addresses) in the ...

Mapped Space is virtual memory that has been mapped  to a specific virtual address (or range of virtual addresses) in the process' virtual address space.  Write Copy protection is used when memory is shared for reading but not for writing.  When processes are reading this memory, they can share the same memory, however, when a sharing process wants to have write access to this shared memory, a copy of that memory is made.