Google, Microsoft and Yahoo are keeping detailed search engine data for also long and not creation it adequately nameless later, in infringement of European rule, the European Union's data defense advisory body has warned.

The three corporations’ conventional letters from the Article 29 Data Protection Working Party, which supervises data defense issues in the E.U.

While 2008, the working party has force search companies to keep extremely detailed search records for no longer than six months. Google, Yahoo and Microsoft all decided to adapt how long they store the detailed data. Their rules at present differ, but some data is kept for up to 18 months.

The data composed by search engines can comprise a host of details, counting the search terms, the date with time of the search, the searcher's IP address and the product of browser, operating system and speech used.

Google keeps the full data for nine months and then unclear the last octet of the IP address. The working party writes to Google and said that the company's rule does not defend the "identifiability of data subjects.

" Also, Google keep cookies data files used to path how a person moves about a Web site -- for 18 months, which would also permit for the association of search inquiry, the working party said.