premise: At the request of the Disclosing Party, the Recipient shall: (a) destroy or return to the Disclosing Party all documents and materials (and any copies) containing, reflecting, incorporating, or based on the Disclosing Party's Confidential Information; (b) save in relation to its backup email systems, erase all the Disclosing Party's Confidential Information from its computer systems or which is stored in electronic form; and (c) certify in writing to the Disclosing Party that it has complied with the requirements of this Clause, provided that a Recipient may retain documents and materials containing, reflecting, incorporating, or based on the Disclosing Party's Confidential Information to the extent required by law or any applicable governmental or regulatory authority and to the extent reasonable to permit the Recipient to keep evidence that it has performed its obligations under this Agreement. 