Thank you for using Langsmith Editor.
As of January, 2022, we will make some changes to the “Langsmith Editor Terms of Service” and “Privacy Policy”.

This English document is a translation of the original Japanese document for the sole purpose of user convenience. It is only the Japanese original that is legally binding. In the event of any discrepancy or inconsistency between the Japanese original and the English translation, the Japanese original shall prevail.

This change is mainly for Tohoku University Plan and clarification of rights ownership, and will not affect current users.

We would like to thank you for your understanding.

Details of changes


Terms of Use – Attribution of Rights

Before revision

All intellectual property rights and other rights related to trademarks, patents, copyrighted works, Text Data, etc. and all other information contained in the Service belong to us or a third party who has granted such rights to us.
You will not acquire any rights other than the rights explicitly granted by these Terms of Use and the Individual Terms.

After revision

  1. The copyright(This includes the rights set forth in Article 27 and Article 28 of the Copyright Act.) of (i) character data and voice data such as text and terminology inputted by the User through the Service, and (ii) data(This service presents multiple choices of character data, etc. to the user, but does not include data related to choices not adopted by the user.) adopted by the User out of character data and voice data such as text and terminology generated by the Service shall belong to the User.
  2. Users (excluding paid plan users) shall grant us a free license to use the data whose copyright belongs to the user based on the preceding paragraph for the following purposes.
    (1)Improvement of the Service (including, but not limited to, training of neural networks and algorithms)
    (2)Research presentations by us, joint research with universities and research institutions, and other academic and educational activities
    (3)Storage on the servers of us and its designated subcontractors to the extent necessary for the purposes of the preceding items, and provision to third parties
  3. All intellectual property rights and other rights related to trademarks, patents, copyrights (excluding copyrights stipulated in the preceding paragraphs), Text Data, etc., and all other information contained in this service shall belong to us or a third party that has licensed such rights to us.
  4. You will not acquire any rights other than the rights explicitly granted by these Terms of Use and the Individual Terms.
  5. The attribution of copyrights and other rights not specified in this article shall be in accordance with the Copyright Act and other laws and regulations, and we shall not acquire any rights that should be attributed to third parties based on laws and regulations.

Terms of Use – Working with Google Drive

Before revision

If you are on a plan that requires membership registration (a plan other than the Guest plan), you can link the Service to your Google Drive and use it as a storage destination for your text data. Please check here for the terms of use of Google Drive.

After revision

If you are on a plan that requires membership registration (a plan other than the Guest plan), you can link the Service to your Google Drive and use it as a storage destination for Text Data, etc. Please check here for the terms of use of Google Drive.


Privacy Policy – Scope of Information to be Obtained – Free plans (Guest Plan, Free Plan)

Before revision

When using the Service, please enter only the text you wish to transfer to our server. This is necessary in order for us to create “rewrites”, “auto-completions”, etc., and provide our services to you. We process this information only for training and improvement of the neural network and algorithms in a way that is not tied to your personal information.

After revision

Free plans (Guest Plan, Free Plan,Tohoku University Plan)
When using the Service, please enter only the text you wish to transfer to our server. This is necessary in order for us to create “rewrites”, “auto-completions”, etc., and provide our services to you. We process Text Data, etc. and other information in a form that is not linked to personal information, and only for the purpose of improving our services.

Privacy Policy – Scope of Information to be Obtained – Paid plans (Premium Plan, Enterprise Plan)

Before revision

When using the Service, please enter only the text you wish to transfer to our server. This is temporarily necessary in order for us to create “rewrites”, “auto-completions”, etc., and provide our services to you. We neither keep any of the Text Data, etc. you enter, nor process it for training and improvement of the neural network and algorithms. During the free trial period of the Free plan, this item is not applicable even if you use the paid plan functions.

After revision

When using the Service, please enter only the text you wish to transfer to our server. This is temporarily necessary in order for us to create “rewrites”, “auto-completions”, etc., and provide our services to you. We will not leave any input Text Data, etc. on the servers of our company or our designated subcontractors. During the free trial period of the Free plan, this item is not applicable even if you use the paid plan functions.


Privacy Policy – Scope of Information to be Obtained – Plans that require membership registration (other than Guest plan) – Working with Google Drive

Before revision

If you are on a plan that requires membership registration (a plan other than the Guest plan), you can link the Service to your Google Drive and use it as a storage destination for your text data. For more information about Google Drive, please refer to Google’s privacy policy.

After revision

If you are on a plan that requires membership registration (a plan other than the Guest plan), you can link the Service to your Google Drive and use it as a storage destination for Text Data, etc. For more information about Google Drive, please refer to Google’s privacy policy.