return sub_authority[sub_authority_count - 1];
    }

    /**
     * Returns the type of this SID indicating the state or type of account.
     * <p>
     * SID types are described in the following table.
     * <tt>
     * <table>
     * <tr><th>Type</th><th>Name</th></tr>
     * <tr><td>SID_TYPE_USE_NONE</td><td>0</td></tr>
     * <tr><td>SID_TYPE_USER</td><td>User</td></tr>