Session cookies only collect nonpersonally identifiable data, and once a user closes his or her browser, the cookies disappear.</dd> <br> <dt> <em>Persistent Cookies</em> </dt> <dd>Persistent cookies store information on a user’s computer for longer periods of time than session cookies, and the information is stored across multiple sessions. The Copyright Office never uses persistent cookies to collect personally identifiable information about its website visitors. The Copyright Office does use persistent cookies to improve its web metrics by distinguishing between new and returning visitors. to prevent repeated prompting to complete its customer satisfaction survey. to aggregate data anonymously on how visitors use its sites. and to “remember” preferences that users provide voluntarily.</dd> <br> <dt> <em>Customization tools</em> </dt> <dd>Customization tools allow users to voluntarily provide information to personalize and improve their online experience on a particular Copyright Office webpage and site.