ER 1.6 scares many lawyers. But if you keep one -- yes, just one -- overarching principle in mind about information relating to client representation, I doubt you'll ever have a problem with your clients, the State Bar or courts. Here's that one overarching principle:
Start with the proposition that because all information related to your client is confidential, you keep your mouth shut. Keep potential loose lips locked.
Then, and only then, you take the next step: does a rule allow or require me to disclose information?
ERs and other rules to think about:
A few of my favorite State Bar of Arizona ethics opinions about confidentiality:
Op. 93-11: You can't instigate criminal prosecution against former client whose checks for your fees bounce. As much as you might want to do this, you can't.
Op. 01-02: If you learn information during the course of representing an incapacitated person, a vulnerable adult, or someone who owes a fiduciary duty to such a person that is required to be reported under A.R.S. § 46-454 (the vulnerable adult statute), you may disclose that information to authorities based on ER 1.6(d)(5).
Op. 97-05: It's OK under ER 1.6 to allow interpreters, parents or advocates to be present during an attorney-client conversation. Whether the attorney-client privilege is affected is a question of law, however.