Stanford Centre for the Internet and Society (CIS) has released a set of Privacy Icons for eMail ("Privicons") and an implementation for Google Chrome. The icons (pictograms) The "Don't Attribute" and "Don't Print" are reasonably clear, the others are a bit hard to fathom. But as long as they are used consistently that doesn't matter.
I like the idea of the "Don't Attribute". This is teething with Creative Commons is lacking: every one of the licenses requires you to acknowledgment the originate author.