Terms of Service

1. About these Terms

1. These Terms set out the conditions for using the Service and the rights, obligations and responsibilities of you and the operator.
2. By using the Service, you agree to these Terms. If you don't agree, please don't use the Service.
3. These Terms are available in English and Korean. If the two differ, the Korean version prevails to the extent the law allows.
4. Anything these Terms don't cover is governed by the applicable laws and general commercial practice.

2. Definitions

• Service: OpenTex at www.opentex.ai and its features.
• Operator, we, us: Sangho Yun, the individual who runs the Service.
• You: anyone who uses the Service, signed in or not.
• Account holder: a user who has signed in with a Google account.
• Content: the projects, files, comments and other material you create, import or upload in the Service.
• Project in an account: a project stored in an account holder's account rather than only in a browser.
• Members: the people who have access to a project in an account, as its owner, editor, reviewer or viewer.

3. The Service

OpenTex is a LaTeX editor that runs in your web browser. Its features currently include:

• editing LaTeX projects and compiling them in your browser with pdfLaTeX or XeLaTeX; projects made without an account are kept in your browser;
• version history, track changes, comment threads, a review log and a project chat;
• importing and exporting projects as ZIP files;
• optional sync with your own GitHub repository;
• a paper library that looks up metadata from scholarly registries;
• optional Google sign-in, with projects stored in your account that open on any device you sign in to, and sharing them with people you invite, as editors, reviewers or viewers.

Features change over time (see Changes to the Service). Anything our website describes as planned or on the roadmap is not part of the Service until it is released.

4. Price

The Service is currently free of charge. We don't promise that the Service, or any feature, will always be available or always be free. If we ever introduce paid features, we will announce them in advance, and you will never be charged unless you explicitly agree to pay.

5. Who can use OpenTex

You must be at least 14 years old to use the Service.

6. Accounts

1. You can use the Service without an account; signing in with Google is optional. While you are signed in, the projects you create, import or move to your account are stored in it, as described in the Privacy Policy.
2. Keep your Google account secure. You are responsible for what happens under your account, unless it results from our fault.
3. Signing out ends the session in that browser and deletes its copy of your account's projects, but leaves the projects made there without an account, your paper library and your GitHub token in it. On a shared computer, clear the site's data as well.

7. Your content

1. You keep all rights to your content. We don't claim ownership of it.
2. Content you create without an account stays in your browser and we don't receive it. For projects in your account, you grant us a non-exclusive, royalty-free license to store, copy and transmit your content, including to the members of the projects you share and to the GitHub repository a project is linked to, only as needed to provide the features you use, for as long as it is stored with us.
3. We don't use your content for any other purpose, don't sell it, and don't use it to train machine-learning models.
4. You are responsible for having the rights to your content and for following the licenses of the packages, fonts, classes and images you use.
5. In a shared project, the members' contributions come together. Each member keeps the rights to what they add and lets the project's members use it within the project as their roles allow, which includes reading, compiling and downloading the project. Any other use of a shared project is a matter between its members.
6. Owners and editors decide whom to invite and with which role, and owners can change roles or remove members at any time. Invite only people who may see the project's content: anyone you add can read and download it and may keep a copy after being removed. You are responsible for sharing only what you have the right to share, including information about other people.
7. The owner of a project can link it to a GitHub repository. Its review record, including members' names, email addresses, comments and suggestions, is then written to that repository, where the repository's owner and GitHub's terms govern it, as the Privacy Policy describes. Deleting content or your account in OpenTex doesn't remove what is already there.
8. Data in your browser can be lost, for example when you clear site data, use a private window, or the browser frees up storage. Projects in your account are stored on our servers, but we can't promise that they will never be lost, and an owner can delete a shared project for every member. Keep your own backups, such as ZIP exports or a GitHub repository.

8. Acceptable use

When you use the Service, you must not:

1. break the law or infringe the rights of others, including intellectual property and privacy rights;
2. upload or distribute malware or illegal content;
3. access, or try to access, other users' data or parts of the Service you aren't authorized to use, or get around its security;
4. overload or disrupt the Service or its infrastructure, for example by sending automated bulk requests to the TeX Live file service;
5. send spam, including through invitations, or impersonate anyone;
6. use the Service in any other way that harms other users or third parties.

9. Third-party services and materials

1. The Service relies on third-party services: Vercel (hosting), Supabase (sign-in, projects in accounts and live updates), Google (sign-in), GitHub (sync, with your own token or the GitHub app you connect; also the review record of projects linked to GitHub), and Crossref, DataCite and OpenAlex (paper metadata). When you use them through OpenTex, their own terms and privacy policies also apply.
2. Your GitHub token, or the tokens of the GitHub app you connect, stay in your browser; our server only passes the app's tokens on when you connect or renew them. You decide a token's permissions and where the app is installed, and you revoke them at GitHub when you no longer need them.
3. TeX Live packages, classes and fonts come from the public TeX Live archives and are licensed by their authors under their own licenses.
4. Metadata is shown as each registry publishes it. Check references yourself before you rely on them.
5. We aren't responsible for third-party services or materials, or for changes to them, unless we are at fault.

10. Donations

You can support OpenTex through GitHub Sponsors. Donations are voluntary and handled entirely by GitHub under GitHub's terms. A donation doesn't buy any product, feature, priority support or other right, and doesn't change these Terms. Payments, cancellations and refunds are handled by GitHub under its terms.

11. Our rights

The OpenTex name and logo and the Service's software and design belong to the operator or to their respective rights holders. These Terms give you no rights in them beyond using the Service as these Terms allow. Third-party software, fonts and packages used in the Service remain under their own licenses.

12. Changes to the Service

1. We may add, change or remove features, or suspend or end the Service, for example for maintenance, security, cost or legal reasons.
2. For changes that significantly affect you, such as ending the Service or the storage of projects in accounts, we will announce them on the website in advance where we reasonably can, and give you a reasonable period to export your projects. Urgent changes, such as security fixes or outage responses, may happen without notice; we will explain them afterwards when needed.

13. Ending your use

1. You can stop using the Service, or leave a project (unless you are its last owner), at any time. To delete your account, email us; the Privacy Policy describes what happens to the projects you share.
2. We may restrict or suspend your use of the Service, or delete your account, if you seriously or repeatedly violate these Terms or the law. Except in urgent cases, such as protecting the Service or other users, we will tell you the reason in advance and give you a chance to respond.
3. Sections that by their nature should continue to apply, such as Your content, Disclaimers, Limitation of liability and Governing law, survive the end of your use.

14. Disclaimers

The Service is provided free of charge, “as is” and “as available”. To the extent the law allows, we don't guarantee that the Service will always work without interruption, errors or security issues, that compiled output will match other TeX distributions, or that metadata and reference checks are accurate or complete. This doesn't exclude or limit any warranty or right that the law doesn't allow to be excluded or limited.

15. Limitation of liability

1. We are liable under the applicable law for damage we cause intentionally or through gross negligence, and for any liability that can't be limited by law, including liability under the Personal Information Protection Act.
2. Otherwise, to the extent the law allows, and considering that the Service is free, we are not liable for:
   1. damage caused by events beyond our reasonable control, such as natural disasters, power or network failures, or outages or changes of third-party services;
   2. loss of data stored only in your browser, or damage caused by your device, browser, network or account security;
   3. disputes between you and third parties, including other members of a project, about content;
   4. indirect, special or consequential damages, or lost profits.
3. Nothing in this section limits the rights you have as a consumer under mandatory law.

16. Governing law and disputes

1. These Terms and any dispute about the Service are governed by the laws of the Republic of Korea.
2. Any lawsuit between you and the operator about the Service will be brought before the court that has jurisdiction under the laws of the Republic of Korea, such as the Civil Procedure Act. This doesn't take away your rights as a consumer under mandatory law, including the right to bring or defend a claim in the courts where you live, or the protection of the mandatory laws of your country of residence.
3. If a dispute comes up, please contact us first; we will try to resolve it quickly and in good faith.

17. Changes to these Terms

1. We may change these Terms when needed, for example to reflect changes to the Service or the law.
2. We will post the new Terms on this page, with their effective date and the reason for the change, at least 7 days before they take effect, or at least 30 days before for changes that are unfavorable to you. We will also email account holders about unfavorable changes.
3. The notice will say that continuing to use the Service after the effective date means you accept the new Terms, and it does. If you don't agree, you can stop using the Service and ask us to delete your account.

18. Contact

Questions about these Terms go to sanghoyun@postech.ac.kr.