(a) After the commencement of a cancellation proceeding, if the respondent applies for cancellation of the involved registration under section 7(e) of the Act of 1946 without the written consent of every adverse party to the proceeding, judgment shall be entered against the respondent. The written consent of an adverse party may be signed by the adverse party or by the adverse party's attorney or other authorized representative. (b) After the commencement of a cancellation proceeding, if it comes