Effective Date: May 3, 2026
Last Updated: May 3, 2026
1. Parties and Subject Matter
This End User License Agreement (“Agreement”, “EULA”) is entered into between, on the one hand, Abdullah Utku Üzülmez (“Data Controller”, “we”, “us”), the developer and distributor of the Kifu Master application (“the App”, “the Service”), and, on the other hand, the natural person who downloads, installs, or uses the App (“User”, “you”).
By downloading, installing, or using the App, you represent that you have read, understood, and accepted all provisions of this Agreement. If you do not accept the Agreement, you must not use the App and must remove it from your device.
This Agreement shall be read together with the separately published Privacy Policy. The Privacy Policy is an integral part of this Agreement.
2. Grant of License
Subject to your compliance with the terms of this Agreement, the Data Controller grants you a personal, non-exclusive, non-transferable, non-sublicensable, and revocable limited license to use the App for personal and non-commercial purposes.
This license covers only the use of the App as intended — viewing, replaying, analyzing, and editing kifu (game record) files for the game of Go (also known as Baduk or Weiqi). All rights not expressly granted are reserved by the Data Controller.
3. Account Creation and Responsibility
You may need to create an account to use certain features of the App. When creating an account, you agree to provide accurate, current, and complete information.
You are solely responsible for the security of your account. It is your obligation to keep your password confidential, to be responsible for all activities carried out from your account, and to contact us immediately in the event of unauthorized access.
A user may have only one active account. Creating multiple accounts, using another person’s account, or transferring your account to another person is prohibited.
4. Premium Subscription
4.1. Scope of the Subscription
In addition to free basic features, the App offers a paid Premium subscription. The Premium subscription includes full access to the Pro Database, the removal of library and favorites limitations, and other privileged features that the Data Controller may add from time to time. The scope of the free and Premium plans may be updated from time to time.
4.2. Price and Term
The Premium subscription is offered on a monthly basis. Current pricing information is displayed on the App’s page on Google Play. The price may vary according to your country, tax regulations, and exchange rates.
4.3. Automatic Renewal
The Premium subscription renews automatically. Unless you cancel your subscription at least 24 hours before the end of the current period, the next period’s fee will be charged to your registered payment method, and your subscription will be extended for the same duration.
4.4. Cancellation
You may cancel your subscription at any time via Google Play > Account > Payments and subscriptions > Subscriptions.
When you cancel, your access to Premium features continues until the end of your current payment period; no charge will be made for the next period. The Data Controller cannot directly intervene in the cancellation process; this process is managed entirely by Google Play.
4.5. Price Changes
The Data Controller reserves the right to change subscription prices. Price changes take effect after the current subscription period ends. Significant price changes are notified to Users in accordance with Google Play’s policies. If you do not accept the change, you may cancel your subscription before it renews.
5. Refund Policy
Because Premium subscription payments are processed directly by Google Play, refund requests are subject to Google Play’s refund policy. To request a refund, you may use Google Play > Account > Order history.
The Data Controller cannot intervene in refund decisions and does not have the authority to issue refunds directly. You must submit your refund requests through the channel above.
6. Redeem Codes
The Data Controller may from time to time distribute redeem codes that grant access to the Premium subscription for promotional, gift, or appreciation purposes. The following terms apply to such codes:
- Redeem codes are distributed free of charge; they cannot be converted into cash or any other value
- Codes allocated for individual use are personal, non-transferable, and non-resaleable
- The number of uses, validity period, scope, and other terms of each code are determined by the Data Controller at the time of distribution; these terms may vary from code to code
- The Premium right activated by a code is valid only for the duration corresponding to the code’s scope
- The Data Controller reserves the right to bind redeem codes to a validity period, cancel them, or reissue them
- Codes that are unused, expired, found to have been obtained in bad faith, or revoked will not be replaced, compensated, or refunded
- Automatic renewal is not triggered during the Premium period obtained via a redeem code; Premium rights end automatically upon expiry
The User is responsible for any damages arising from the theft, loss, or sharing of redeem codes with others.
7. Pro Database — Terms of Use
The App provides a database (“Pro Database”) containing 150,000+ professional Go game records in SGF format. The following provisions apply to this database:
7.1. Nature of the Content
The game records contained in the Pro Database consist of publicly available historical and sporting facts and are not, individually, protected by copyright. However, the compilation, curation, deduplication, standardization of player identities, grouping of tournaments and events, and metadata enrichment processes of the database are the product of the Data Controller’s original work and effort. The compilation as a whole is considered the intellectual property of the Data Controller.
7.2. Permitted Use
Within the scope of your Premium subscription or free plan, you may view, replay, analyze, and use the contents of the Pro Database via the App for your personal study.
7.3. Prohibited Uses
The following activities are strictly prohibited and constitute a material breach of this Agreement:
- Obtaining, copying, reproducing, or attempting to do any of the foregoing with respect to the Pro Database or any part of it through automated tools, scrapers, bots, or bulk download methods
- Using, distributing, or republishing the database or any derivative datasets within another application, website, service, or publication
- Creating derivative works (including compilations, subsets, indexes, statistics, or analytical outputs) from the database and offering them to third parties
- Selling, renting, licensing, or commercially exploiting the database or any part of it
- Extracting, decoding, or using outside the App the internal data sources, supporting files, or configuration resources that the App uses to operate
- Attempting to circumvent technical restrictions, rate limits, or authentication mechanisms used to access the database
In the event of a breach of these provisions, the Data Controller reserves the right to suspend or terminate your account, apply technical access restrictions to the device or connection used in the breach, pursue legal remedies, and seek compensation for damages incurred.
8. User Content — Your SGF Files
The SGF files you upload, create, save, or favorite within the App (“User Content”) belong entirely to you. The Data Controller does not claim any rights over the ownership, content, or accuracy of your User Content.
Likewise, the Data Controller bears no responsibility for:
- The storage, backup, or recovery of User Content
- The accuracy, quality, or legality of the information contained in it
- The recovery of files lost in the event your device is lost, damaged, reset, or the App is uninstalled
As stated in our Privacy Policy, your SGF files are stored only in your device’s local storage (IndexedDB) and are not uploaded to our servers. Backing up your User Content is entirely your responsibility.
It is also your obligation to ensure that your User Content does not infringe third-party rights (copyright, privacy, etc.).
9. Unacceptable Use
You agree to refrain from the following activities while using the App:
- Analyzing or modifying the source code of the App through reverse engineering, decompilation, or disassembly
- Bypassing or disabling the App’s security mechanisms, subscription controls, premium gatekeepers, or authentication systems
- Engaging in conduct that endangers, overloads, or destabilizes the App or its infrastructure (DDoS, automated request flooding, etc.)
- Using the App for illegal, fraudulent, deceptive, or harmful purposes
- Using fake or stolen payment information
- Repackaging, distributing, publishing, or selling the App or its content under your own name or as part of another service
- Engaging in harassment, threats, insults, or malicious behavior toward other users or the Data Controller
- Removing or altering trademarks, copyright notices, or proprietary notices contained in the App
10. Intellectual Property Rights
The App, including all of its components — source code, design, interface, visual elements, logos, name, content, compiled databases, and written documentation — belongs to or is licensed by the Data Controller. All rights are reserved.
The “Kifu Master” name and the associated logo are naming and visual identity elements belonging to the Data Controller. They may not be used for commercial purposes without prior written consent.
The App uses various open source software libraries. License information for these libraries is listed on a separate Open Source Licenses page, and the relevant license terms are honored.
This Agreement grants you the right to use the App; it does not transfer ownership of the App or any of its components.
11. Third-Party Services
The App uses the following third-party services to operate:
- Google Play: Distribution and in-app payments
- Google Firebase: Authentication and database
- RevenueCat: Subscription management
- GitHub Pages: Distribution of the Pro Database
These third-party services have their own terms of use and privacy policies. The Data Controller cannot be held responsible for issues arising from the operation, outages, or policy changes of these services. For more information about the use of third-party services, please refer to our Privacy Policy.
12. Disclaimer of Warranties
The App is provided “AS IS” and “AS AVAILABLE“. To the maximum extent permitted by law, the Data Controller makes no warranties, express or implied. Without limitation, no representation is made regarding:
- Fitness for a particular purpose
- Merchantability
- Uninterrupted, error-free, or completely secure operation
- Compatibility with all devices, operating systems, or software versions
- The completeness, accuracy, or currency of the Pro Database content
- The prevention of data loss
All risk associated with the use of the App lies with the User.
13. Limitation of Liability
To the maximum extent permitted by law, the Data Controller shall not be liable — for damages arising from the use of, or inability to use, the App — for the following:
- Indirect, incidental, special, consequential, or punitive damages
- Loss of profit, loss of revenue, loss of business, loss of reputation
- Data loss, deletion or corruption of SGF files
- Damages arising from the interruption or failure of third-party services
- Failures or software issues that may occur on your device
In any event, the Data Controller’s total monetary liability arising under this Agreement is limited to the total amount you have paid to us for the Premium subscription within the 12 months preceding your claim. For Users who have made no Premium payments, this cap is zero.
Mandatory liabilities provided under consumer protection legislation are not affected by this provision.
14. Account Suspension and Termination of the Agreement
14.1. By the Data Controller
The Data Controller may suspend, restrict, or fully terminate your account, without prior notice, in the following situations:
- Breach of any provision of this Agreement
- Attempted scraping, bulk downloading, or redistribution of the Pro Database
- Reverse engineering of the App or attempts to bypass its security mechanisms
- Use of multiple accounts or account sharing
- Use of fake, stolen, or disputed payment information
- Misuse or bad-faith acquisition of redeem codes
- The need to comply with legal obligations or court orders
- Conduct that threatens the security of the App or other users
In the event your account is terminated, the obligation to provide a refund for paid but unused Premium periods is at the Data Controller’s discretion based on the nature of the breach. In cases of material breach, no refund may be issued.
14.2. By the User
You may terminate this Agreement at any time by uninstalling the App from your device and closing your account (via the Profile > Delete Account menu). You must also separately cancel your active subscription via Google Play.
14.3. Effects of Termination
Upon termination of the Agreement, the license rights granted to you immediately end. Provisions of this Agreement that by their nature must remain in effect after termination (intellectual property, limitation of liability, jurisdiction, etc.) shall continue to apply.
15. Changes to the Agreement
The Data Controller reserves the right to update this Agreement from time to time. Changes are published by revising the “Last Updated” date at the top of this page. The Data Controller has no obligation to provide individual notice of changes; it is the User’s responsibility to review the current Agreement regularly.
Your continued use of the App after changes take effect constitutes your acceptance of the updated Agreement. If you do not accept the changes, you must stop using the App and close your account.
16. Age Limit and Legal Capacity
To use the App, you must be at least 13 years old (or at least 16 years old in European Union countries). Users below this age limit may use the App only under the supervision and consent of a parent or legal guardian.
In the event a minor user takes out a Premium subscription or makes a paid transaction, responsibility lies with the parent or legal guardian.
You represent that you have the legal capacity to enter into and accept this Agreement.
17. Force Majeure
The Data Controller cannot be held liable for the temporary or permanent disruption of the App’s service due to events beyond our reasonable control, such as natural disasters, war, pandemics, government regulations, internet infrastructure outages, service disruptions of third-party providers (Google, Firebase, RevenueCat, etc.), or cyberattacks.
18. General Provisions
18.1. Governing Law and Jurisdiction
This Agreement is governed by and construed in accordance with the laws of the Republic of Türkiye. The Istanbul (Çağlayan) Courts and Enforcement Offices shall have jurisdiction over disputes arising under this Agreement. The right of consumer Users to apply to Consumer Arbitration Boards and Consumer Courts is reserved.
18.2. Severability
If any provision of this Agreement is found to be invalid, unlawful, or unenforceable, the validity of the remaining provisions shall not be affected. The invalid provision shall be deemed replaced by a valid provision closest to the original intent.
18.3. Waiver
The failure or delay by the Data Controller to exercise any right under this Agreement shall not constitute a waiver of that right.
18.4. Assignment
The User may not assign their rights and obligations under this Agreement to third parties without the written consent of the Data Controller. The Data Controller may assign this Agreement and the rights arising from it to its successor in the event of a merger, acquisition, asset sale, or similar circumstances.
18.5. Entire Agreement
This Agreement, together with the referenced Privacy Policy, constitutes the entire agreement between the parties and supersedes all prior oral or written agreements relating to the use of the App.
18.6. Notices
Notices to be made by the Data Controller to you when necessary may be made via your registered email address or through in-app notifications. Notices to us must be made to the contact information set out below.
19. Contact
Developer: Abdullah Utku Üzülmez
Email: gotesensei@gmail.com
Web: gotesensei.club
For questions, requests, or notices regarding this Agreement, you may contact us at the email address above.
This Agreement has been prepared in compliance with the Turkish Consumer Protection Law No. 6502, the Turkish Code of Obligations No. 6098, the Law on Intellectual and Artistic Works No. 5846, and related legislation of the Republic of Türkiye. The mandatory rights of consumer Users arising from the relevant legislation are reserved.