Define access right (#124)

Author: lechten

processes.tex

@@ -948,7 +948,9 @@ \subsection{Fundamentals of Access Rights}\label{access-fundamentals-subsections
 repertory of \vocabs{operation} that a subject can perform on it, if
 the protection system permits: for example, a memory region may have
 read and write operations, whereas a naming service may have lookup,
-insert, and modify operations.  Each subject is also an object,
+insert, and modify operations.  An \vocab{access right} is a
+permission for a subject to invoke an operation on an object.
+Each subject is also an object, 
 because operations can be performed on subjects, such as the operation
 of terminating a process.