1. For instance, he mentions a FISA court order referring to the NSA's interpretation of section 215 of the PATRIOT act--FISA documents are rarely unclassified (it's a secret court, after all), and secret interpretations by the NSA are just as likely to be highly classified.
2. Sorry, I'm not well versed in this area. I imagine Patraeus followed the rule when publishing his memoirs.
Here are some links that might lead to what you're looking for: