on a computer that enable us to recognize visitors when they open websites that are part of the Google Network. On these pages, advertisements may be displayed that refer to contents that the visitor opened [...] The principle of purpose limitation states that data shall be collected for specified, explicit and legitimate purposes and not further processed in a manner that is incompatible with those purposes. Further [...] the cookie. When you open our web page, cookies that are technically required (session cookies) are saved on the hard drive of your computer. Cookies that are necessary to ensure technically correct and