EPIC: "European privacy officials have established "a clear set of responsibilities" on search engine companies regarding their handling of user data. The opinion, issued by the Article 29 Working Group, states that the European Union Data Protection Directive requires search engines to "delete or irreversibly anonymise personal data once they no longer serve the specified and legitimate purpose" for which they were collected. This requirement has particular significance for search engines, because European privacy rules classify Internet Protocol (IP) addresses as "personal data." The opinion further holds that European privacy laws generally apply to search engines "even when their headquarters are outside [Europe]," and requires that search engines must delete personal data within six months of collection. Earlier this year, EPIC urged the European Parliament to protect the privacy of search histories. For more information, see EPIC's Search Engine Privacy page."