Data Storage and Anonymization

In order to provide products and services, Yahoo collects and stores information from user account registration and site usage. We generally refer to the information that we collect in connection with site usage as “user log data”.

Yahoo’s policy is to de-identify search user log data within 18 months of collection, with limited exceptions to meet legal obligations.

In addition to the other purposes for which we collect information, other types of log data (ie not relating to search) (such as ad views, ad clicks, page views and page clicks) are retained for a longer period in order to power innovative product development, provide personalized and customized services, and better enable our security systems to detect and defend against fraudulent activity. Yahoo takes additional steps so that data collected and used to customize interest based advertising (along with some content) on Yahoo are not associated with personally identifiable information. We describe the data we store, and our processes in more detail here.

You can also modify information you have provided to Yahoo through the Yahoo products or services you may use.

Account Information

  • When you register with Yahoo or submit information to Yahoo, a temporary copy of that information is routinely made to prevent accidental loss of your information through a computer malfunction or human error.
  • Yahoo keeps your account information active in our user registration databases in order to provide immediate access to your personalization preferences each time you visit Yahoo.
  • If you ask Yahoo to delete your Yahoo account, in most cases your account will be deactivated and then deleted from our user registration database in approximately 40 days with longer hold periods for accounts registered in: Australia or New Zealand (approx. 90 days); Brazil or Taiwan (approx. 180 days). This delay is necessary to discourage users from engaging in fraudulent activity.
  • Please note that any information that we have copied may remain in back-up storage for some period of time after your deletion request. This may be the case even though no account information remains in our active user databases.

Servers Log Files

  • The Yahoo computers (called "servers") that send your web pages and advertising banners process and store an enormous amount of information every day. These computer records are called “log files”.
  • Log files are used for analysis, research, auditing, and other purposes, as described above. After this information has been used, it is stored and is inaccessible. Until the information is stored, your Yahoo ID may remain in our active server log files.


  • Anonymization is a process of removing or replacing personal identifiers in data records so that the resulting data is no longer personally identifiable. This is also referred to as de-identification. We use these terms interchangeably.
  • Yahoo uses a multi-step process to replace, truncate, or delete identifiers in order to de-identify data. We are committed to continuous improvements and implementation of our data protection and de-identification measures.


  • Yahoo’s anonymization policy applies only to search log data.
  • Yahoo stores this data in an identifiable form for up to 18 months.
  • IP addresses within search user log data will be anonymized or deleted within 6 months from the time of collection.


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Yahoo Privacy

Our Yahoo Privacy Policy describes our approach to privacy on "Maktoob from Yahoo" We also encourage our users to visit our detailed reference links that provide more information about specific products and services relevant to this website. Start by clicking the "products" and "topics" buttons above!