CRMs Selling Information?

Hey guys, I have a question about CRMs and how secure they are.

I've recently started working for a pretty large company that has about 6 employees, but is expanding pretty quickly. I would like to find a CRM service that won't sell our information online, or be sure that the one I choose will not be doing this.

This concern is due to us recently purchasing a subscription to ZoomInfo, which is a lead service that gives out some company information. They're buying this information from somewhere and I would like to ensure that our clients will not be shown as ours.

Any recommendations for CRMs that are secure or preferably offline? Anything would be greatly appreciated.