Apparently, all the discussion about Pinterest and copyright has caught the attention of the company higher-ups over there. Last Wednesday, I mentioned that by putting a special meta tag in the header of the html for a page, Pinterest would disallow pinning by their bookmarklet. I thought this was something that I had originally missed while scanning through their help documentation. However, it seems like this was actually a new attempt (along with a 500 character limit on comments) to allow artists some control over their work.
As a company, we care about respecting the rights of copyright holders. We work hard to follow the DMCA procedure for acting quickly when we receive notices of claimed copyright infringement. We have a form for reporting claims of copyright violations on our site here. Every pin has a flag to make reporting easier. We also know that copyright is a complicated and nuanced issue and we have knowledgable people who are providing lots of guidance.
Somewhat humorous, considering they encourage users to copy and reuse images as they see fit. You can read more in the Pinterest blog here.