premise: Proprietary Information shall be designated as such in writing by the Disclosing Party by appropriate legend or stamp, or, if first disclosed in a non-written or other non-tangible form, Proprietary Information shall be identified by the Disclosing Party at the time of disclosure as being disclosed in confidence and shall be reduced to tangible form and marked as confidential or proprietary and such tangible form shall be delivered to the Receiving Party within thirty (30) days after the date of first disclosure. 