The AUTHID property affects the name resolution and privilege checking of SQL statements at runtime; however, it does not affect the compilation, and has no meaning for blocks that have no code, such as collection types.
Any procedure may be created with its AUTHID property set to either the DEFINER or the INVOKER rights. If a procedure is created with the DEFINER rights, then the user executing the procedure need not have an access to database objects, which the procedure is accessing. However, if a procedure is created with the INVOKER rights, then the user must have access rights to all the objects that the procedure is accessing.
Any procedure may be created with its AUTHID property set to either the DEFINER or the INVOKER rights. If a procedure is created with the DEFINER rights, then the user executing the procedure need not have an access to database objects, which the procedure is accessing. However, if a procedure is created with the INVOKER rights, then the user must have access rights to all the objects that the procedure is accessing.