Some clients prefer to engage in a nondisclosure arrangement. That is perfectly fine and understandable. All business owners should be careful in protecting their information. This type of agreement protects both parties.

Here is a generic Nondisclosure Agreement that can be used:

https://www.dropbox.com/s/4p2hmpajwp4ofvr/nondisclosure%20agreement.docx?dl=0

Blessings,

Ken