premise: Upon the request of the Disclosing Party, the Receiving Party shall  (i) destroy all memoranda, notes, records, drawings, manuals, other documents or materials and any other manifestation (and all copies thereof) pertaining to or arising from the Confidential Information in any form or medium (whether written, typewritten, recorded, electronic or otherwise) and  (ii) at the option of the Receiving Party, either return to the Disclosing Party or destroy the Confidential Information supplied by the Disclosing Party or its Representatives.  Upon the return and/or destruction of such materials, the Receiving Party agrees to certify, in writing, that all of the foregoing materials have been destroyed or surrendered to the Disclosing Party.