BEGIN
  SYS.DBMS_RLS.ADD_POLICY     (
    object_schema          => 'SCOTT'
    ,object_name           => 'CARDS'
    ,policy_name           => 'STRICT'
    ,function_schema       => 'TCTDBS'
    ,policy_function       => 'SV_DB_POLICIES.STRICT_POLICY'
    ,statement_types       => 'SELECT,INSERT,UPDATE,DELETE'
    ,policy_type           => dbms_rls.shared_context_sensitive
    ,long_predicate        => FALSE
    ,update_check          => TRUE
    ,static_policy         => FALSE
    ,enable                => TRUE );
END;
/

-- Here only Scott user can select,insert,update and delete on cards table under scott schema . Now from another user 'test' , I cannot select this CARDS table , although I give the select permission .

grant select on scott.cards to test ;

SQL > conn test/test
SQL> select count(*) from scott.cards;

  COUNT(*)
----------
         0

grant EXEMPT ACCESS POLICY to TEST;