Request for Disclosure From Law Enforcement Agencies

This webpage contains information on how we respond to disclosure requests received from law enforcement agencies.

Yahoo! JAPAN’s Response Policy to Disclosure Requests

In principle, Yahoo! JAPAN does not disclose information about our users to a law enforcement agency requesting user information, unless the request is based on a warrant issued by judges or other procedures that directly obligates Yahoo! JAPAN to disclose information under laws and regulations (includes cases where disclosure is indirectly mandated by explicit laws and regulations).

However, in exceptional cases, Yahoo! JAPAN may consider responding to disclosure requests to that extent that both the necessity and the validity of disclosure are recognized.


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The exceptional cases where disclosure may be deemed necessary are:

  1. When there is an imminent threat to life or physical integrity of a person , and Yahoo! JAPAN recognizes the urgency.
  2. When Yahoo! JAPAN recognizes that there is a high probability that the specific criminal facts on which the disclosure request is based exist. (Yahoo! JAPAN will not respond to exploratory requests for information.)

<Specific examples>

  • Threats, stalking, and other incidents made on Yahoo! JAPAN's user submission service
  • Cases in which payment information was misused, resulting in unidentified bills from Yahoo! JAPAN
  • Unauthorized access incidents that involved Yahoo! JAPAN IDs
  • Property crimes (fraud, etc.) committed on Yahoo! JAPAN's services, where Yahoo! JAPAN is able to recognize the background, etc.

The exceptional cases where disclosure may be deemed valid are:

  • Information that Yahoo! JAPAN deems necessary to eliminate the risk in 1 above.
  • Information that Yahoo! JAPAN acknowledges as directly related to the fact or condition on which the specific claim is based, in 2 above.

<Specific examples>

  • Registered information of a Yahoo! JAPAN ID to identify the suspect
  • Log-in history of a Yahoo! JAPAN ID pertaining to an alleged incident that took place on Yahoo! JAPAN's service
  • History of service use by a Yahoo! JAPAN ID pertaining to an alleged incident that took place on Yahoo! JAPAN's service

On the other hand, user information described below will not be disclosed even when Yahoo! JAPAN recognizes the necessity and validity of disclosure, unless it is as a result of the execution of a warrant.

  • Information that Yahoo! JAPAN regards to be highly private (e.g. special care-required personal information, credit card information, information that covers a wide range of time periods and items)
  • Information of a person other than the suspect (except when Yahoo! JAPAN received an Emergency disclosure requests pertaining to the protection of human life or body)
  • Information subject to the protection of the secrecy of communications and information that may be subject to such protection

With regard to requests for disclosure of information from foreign governments, etc., Yahoo! JAPAN will consider the decision to disclose information in accordance with the above policy when it receives a request based on the framework of international investigative cooperation, such as the Act on International Assistance in Investigation and Other Related Matters (Act No. 69 of May 29, 1980), and the mutual legal assistance treaties (MLAT) with relevant countries.

Yahoo! JAPAN Transparency Report

Yahoo! JAPAN publishes the Transparency Report to show how it handles disclosure requests received from law enforcement agencies. The report will be updated on a periodic basis in the future.


How to Confirm and Request Disclosure of Your Registered Information

Users can confirm the registered information of their own accounts from the "登録情報 (Registered Information)" page (Japanese only). If a customer wishes to request the disclosure of the identification information of the sender based on Article 4 of the Act on the Limitation of Liability for Damages of Specified Telecommunications Service Providers and the Right to Demand Disclosure of Identification Information of the Senders (Act No. 137 of November 30, 2001), please refer to "プロバイダ責任制限法に関する申告を行う方へ (To Users Filing a Request Based on the Provider Liability Limitation Act)" (Japanese only).