Ethics

I haven't posted in a while, and am not sure this will post readably... but Texas has addressed a topic I've thought about for a long time, and argued about over the years. It's this: can public information ever be "confidential"? Yes, said the Texas Bar Professional Ethics Committee in Opinion 595 (Feb. 2010), just published in the June 2010 Texas Bar Journal at page 478. The bar association reasoned that some "public" information is not "generally known" and so cannot be used against a former client. It is the position I've taken, and I think textually it's right and it protects legitimate client expectations and interests. But what do you think?