question about privacy template/marks for websites

Greetings  - Privacy Gurus,

I have been approached by a customer/colleague who is creating a public 
website that does
not participate in cross-site user tracking or re-sale of any customer 
information to third-parties. A certain
amount of device/browser fingerprint data is collected by the website, 
primarily to improve the quality of the
authentication process. Cookies are only used to track a user session 
and are removed at logout.

They would like
to display a well-known privacy mark (or template) that would indicate 
that they follow such practices.

Is there a relevant template/mark that has found use in some communities?

Thanks,
prateek