Terms of Use

Last updated: September 28, 2026.

These Terms of Use regulate access to and use of the StemTune application, made available by PC e-Business. By installing, accessing or using the application, you declare that you have read and agree to these Terms. If you do not agree, do not use StemTune.

1. Who can use it

You must have the legal capacity to accept these Terms. If you are a minor or legally incapable, use must occur with the knowledge and authorization of your legal guardian, who must monitor the use and purchases made.

2. Recreational and non-professional purposes

StemTune is a tool for entertainment, study and music practice. It uses computer processing to try to separate voice and instruments from audio files. The result is an estimate and may contain inter-track leaks, artifacts, distortions, volume differences, misclassifications, or loss of quality.

The application is not intended for critical activities nor is it a substitute for software, equipment, service or professional judgment. Do not use StemTune as the only tool in presentations, commercial productions, contract work, file preservation, meeting deadlines or any situation in which a failure could cause material damage. Check the results before using them and keep backup copies of the original files.

3. Continuous evolution and technical requirements

StemTune is continually evolving and may require future improvements, corrections and adjustments. Features, processing models, supported formats, performance, limits, and interface may change. Application or operating system updates may be required.

Operation and processing time vary depending on device, operating system, audio duration and quality, available space, memory, battery and other factors. While reasonable efforts are made to keep the application available and functional, uninterrupted operation, compatibility with all devices and files, or perfect or fit-for-purpose results cannot be guaranteed.

4. Audio files and copyright

You should only import, copy, process, modify, export, perform, share or use audio files when:

• holds the necessary rights;
• have valid authorization or license from the holders;
• the content is in the public domain; or
• use is expressly permitted by applicable law.

Possession of or access to a file, streaming subscription, or purchased copy does not automatically grant permission to adapt, distribute, publicly perform, make available, or exploit the work. StemTune does not grant licenses to third party music, recordings, performances or other content.

You are solely responsible for verifying and obtaining the necessary authorizations and for respecting copyrights, related rights, image, voice, brands, contracts and other applicable rights. It is prohibited to use the application to circumvent copy protection or DRM, process illegally obtained content, distribute material without authorization or violate the rights of third parties.

5. Permitted use and prohibited conduct

PC e-Business grants you a limited, personal, revocable, non-exclusive, non-transferable, non-sublicensable license to use StemTune in accordance with these Terms and the app store rules. You must not:

• use the application for an illegal, fraudulent, abusive purpose or that violates the rights of third parties;
• attempt to interfere with the security, integrity or operation of the application;
• reverse engineer, decompile, modify or create a derivative work of the application, except when the law expressly allows it;
• resell, sublicense or commercially exploit the application or access to it without authorization; or
• use automation or any means that imposes undue burden or circumvents technical and commercial limits.

6. Local processing, storage and backups

Audio processing is performed on the device as described in the Privacy Policy. You are responsible for correctly selecting files, maintaining sufficient space, securing the device, and retaining backup copies of the originals and important results. App removal, device crashes, lack of space, updates, or user actions may cause loss of local files or settings.

7. Purchases and subscriptions

Purchases, subscriptions, charges, renewals, cancellations, refunds and restoration of purchases are processed by the applicable application store, such as the Apple App Store or Google Play, in accordance with its rules and rights provided by law. The prices, periods and benefits displayed at the time of purchase prevail. Uninstalling the app does not automatically cancel a subscription.

8. Application Intellectual Property

StemTune, including software, visual identity, texts, interfaces, brands and other proprietary elements, belongs to PC e-Business or its licensors and is protected by applicable legislation. These Terms do not transfer to the user any ownership rights in the application.

9. Third-party services and platforms

The application may depend on the operating system, application store, media libraries, formats, components and third-party services. These third parties have their own terms and policies. PC e-Business does not control unavailability, changes or restrictions imposed exclusively by such services.

10. Responsibility for use

You are responsible for decisions made based on the results, for the way you use and share files, and for damages resulting from unlawful, improper, unauthorized use or use contrary to these Terms. To the maximum extent permitted by applicable legislation, PC e-Business is not responsible for losses arising exclusively from:

• professional, critical or use other than recreational and informed music practice;
• use of files without necessary licenses, authorizations or rights;
• distribution, public performance, publication or improper exploitation of results;
• lack of backups, device failure, incompatibility or lack of resources on the device;
• changes or unavailability of third-party platforms and services; or
• misuse of the application or disregarding the limitations and guidelines presented.

Unforeseen failures can occur despite development, testing and continuous improvement efforts. This does not eliminate or restrict guarantees, duties or responsibilities that cannot be waived by contract, including the rights guaranteed by the Consumer Protection Code. PC e-Business will remain responsible when and to the extent that legislation so determines.

11. Suspension and termination

Access may be suspended or terminated in the event of violation of these Terms, security risk, fraud, legal requirement or discontinuation of the service, subject to consumer rights and applicable legal obligations.

12. Privacy

The processing of information related to the application is described inPrivacy Policy, which integrates these Terms.

13. Changes to these Terms

These Terms may be updated to reflect changes in the application, law or practices of PC e-Business. The update date will be indicated at the top of the page. Where required by law or where the change is material, adequate notice will be provided. Use after the changes come into force represents acceptance of the new version, without prejudice to applicable legal rights.

14. Applicable law and dispute resolution

These Terms are governed by the laws of the Federative Republic of Brazil. Any conflicts will be resolved by the competent court in accordance with applicable legislation, preserving the consumer's right to appeal to the court of their domicile when appropriate.

15. General provisions and contact

If any provision is considered invalid or unenforceable, the remaining provisions will remain in effect. The failure to exercise a right does not represent a waiver. For guidance related to StemTune, see theSupport.