From ABA Site-tation:
At the end of March, Minnesota’s Lawyers Professional Responsibility Board approved a new ethics opinion addressing lawyers’ ethical obligations regarding metadata. Opinion No. 22, available in PDF format on the LPRB’s website, addresses the three primary metadata questions: what is a lawyer’s duty when sending electronic documents; what is a lawyer’s duty when receiving electronic documents; and what is a lawyer’s duty upon discovering confidential or privileged metadata. We’ve updated our metadata ethics opinion comparison chart to include the new Minnesota opinion.