What is their main concern, do they feel unsafe sharing their database? If that's the case, you can include in your contract (not a legal advice) something along the lines: "NON-DISCLOSURE Both parties mutually agree that certain confidential information may be exchanged during the course of this engagement. To ensure the protection of such information and in consideration of the agreement to exchange said information, the parties agree not to disclose the following. a. Technical materials, models and relevant technical articles, technical reports owned by either party; b. Sales materials, including but not limited to all quality management methods, pricing methods, sales methods and Client’s materials; c. All the intellectual property rights (including those exclusively owned by either party, whether owned now or developed in the future); and, d. Any other information that either party claims as confidential." Basically tell them on the call that it's a 100% safe and you have included it in your contract to not share any information related to their company and that it's going to be claimed as confidential... Or something like that. Once again NOT a legal advice. Hope that helped!