I've written previously about the lengths we go to at CourtListener to protect people's privacy, and today we completed one more privacy enhancement.
After my last post on this topic, we discovered that although we had already blocked cases from appearing in the search results of all major search engines, we had a privacy leak in the form of our computer-readable sitemaps. These sitemaps contain links to every page within a website, and since those links contain the names of the parties in a case, it's possible that a Google search for the party name could turn up results that should be hidden.
This was problematic, and as of now we have changed the way we serve sitemaps so that they use the noindex X-Robots-Tag HTTP header. This tells search crawlers that they are welcome to read our sitemaps, but that they should avoid serving them or indexing them.