Have you ever broken a confidentiality agreement?

"I never have, to my knowledge, broken a confidentiality agreement. Despite my reasons for leaving a position, I would never choose to hurt a previous employer in any way."

"Confidentiality agreements are necessary and important to protect an organization. I understand the need for confidentiality and take those factors very seriously. I have never broken the trust of my employer."

Remember to demonstrate that you understand the need and purpose of confidentiality agreements. While many people find them limiting, refusal to honor such agreements is a deal-breaker for many companies.