premise: It is understood that information in an intangible or electronic format containing Evaluation Material cannot be removed, erased or otherwise deleted from archival systems (also known as “computer or system back-ups”) but that such information will continue to be protected under the confidentiality requirements and non-use limitations contained in this letter agreement, and you and your Representatives shall continue to be bound by the obligations of confidentiality and non-use hereunder.  Notwithstanding the foregoing, you and your Representatives may retain one copy of any work product prepared by you or them that contains Evaluation Material to the extent necessary or advisable pursuant to applicable legal or regulatory requirements, professional standards or reasonable business practice; provided that you and such Representatives shall continue to be bound by the obligations of confidentiality and non-use hereunder with respect to such work product.