Confidentiality Clause In Buy-back Contract How Do I Write A Confidentiality Clause At The End Of A File?! Please Help.?

How do I write a confidentiality clause at the end of a file?! Please help.? - confidentiality clause in buy-back contract

In this assessment and the creation of client files of the sample. At the bottom of each page we need it "have this file) is the property of (name of agency and will be treated confidentially, and when it comes to the blah, blah back," but how can I write it is a professional? ! Anyone have any suggestions please?