Starting in August 2026, AtCoder will begin licensing user-submitted source code to AI companies for use as AI training data. The licensed data will include not only submissions made after the start of the program, but also source code that has already been submitted in the past. However, any submission for which AI training has been explicitly opted out will not be included. In connection with this change, we have updated our Terms of Service and Privacy Policy. We believe this data licensing program is necessary to ensure that AtCoder can continue providing programming contests free of charge in the future. At the same time, we do not believe that users should be required to allow their submissions to be used for AI training simply in order to participate in contests. For this reason, we have introduced an opt-out setting for AI training use that applies to all submissions, as well as a separate opt-out setting that can be configured on a per-submission basis. We have also provided a one-month grace period during which users can review and update their preferences. If you do not want your submitted source code to be used for AI training or included in the licensing program, please make sure to update your settings before the grace period ends. For instructions on how to change your settings, please see the following page: How to Opt Out of AI Training (Japanese) - AtCoderInfo (https://info.atcoder.jp/overview/about/ai-training-opt-out) AtCoder will continue pursuing new initiatives to ensure that our programming contests remain free for everyone. Thank you, as always, for your continued support of AtCoder.