Daysta

DAYSTA FOR WINDOWS

Daysta Terms of Service and End User License Agreement (EULA)

Last updated: 2026-08-11 Effective date: 2026-08-11 Version: 1.0

These Terms govern your use of the software "Daysta" (the "Software") provided by Nyarrow Studio ("we", "us", or "our"). By installing, launching, or using the Software, you agree to be bound by these Terms. If you do not agree, do not use the Software and follow the refund process of the store from which you obtained it.

These Terms apply in place of the Microsoft Store Standard Application License Terms. The Software includes third-party components licensed under the GPL and LGPL. In order to preserve the rights those licenses grant to you, we present our own end user license agreement (see Section 5).

1. Definitions

  1. "Software" means the Daysta application provided by us, together with the bundled data, models, and assets, and any updates thereto.
  2. "You" means the individual or entity using the Software.
  3. "User Content" means the videos, images, and music you load into the Software, and the videos and other outputs you produce using the Software.

2. Acceptance and Changes to These Terms

  1. You accept these Terms on the consent screen shown when you first launch the Software.
  2. We may modify these Terms without obtaining your individual consent, in accordance with Article 548-4 of the Civil Code of Japan, where:
    1. the modification is in the general interest of users; or
    2. the modification is not contrary to the purpose of the contract and is reasonable in light of the necessity of the modification, the appropriateness of the modified terms, the existence of this provision, and other relevant circumstances.
  3. When we modify these Terms, we will set an effective date for the modified Terms and, reasonably in advance of that date, announce the fact of the modification, the modified terms, and the effective date, within the Software or by posting on our website.
  4. If you do not accept a modification, you may stop using the Software before the effective date. Refunds of amounts already paid are governed by the refund policy of the store from which you purchased.
  5. If you are a consumer in the EU/EEA and a change to these Terms or to the Software (including a change to or removal of features by an update) negatively affects your use of the Software in a way that is more than minor, you may terminate the contract free of charge within 30 days of receiving notice of the change or of the change taking effect, whichever is later. Any refund on termination is handled through the store from which you purchased, in accordance with applicable law.

3. License Grant

  1. Subject to your compliance with these Terms, we grant you a non-exclusive, non-transferable, non-sublicensable right to use the Software.
  2. You may install and use the Software on Windows devices you control, up to the number of devices and in the manner the store from which you obtained it allows for your account.
  3. Videos and other outputs you create with the Software belong to you. We claim no rights in them and place no restriction on their use, including commercial use (but see Section 6 regarding clearing rights in User Content).
  4. Those parts of the Software in which we hold rights are licensed, not sold, and all rights not expressly granted in these Terms are reserved by us. Third-party components are governed by Section 5.

4. Prohibited Conduct

You may not:

  1. Copy, distribute, lend, sell, or sublicense the Software (except to the extent permitted by the third-party licenses described in Section 5);
  2. Reverse engineer, decompile, or disassemble the Software, except:
    1. to the extent permitted by the third-party licenses described in Section 5;
    2. for the purpose of debugging modifications to components licensed under the LGPL (such as libmpv), including analysis of those components and of the portions of the Software combined with them — we do not restrict this, as required by Section 4 of the LGPL; or
    3. to the extent applicable law does not permit such a restriction;
  3. Remove or alter any copyright, trademark, or license notice in the Software;
  4. Circumvent, by technical means, the feature limitations that apply when you use the Software free of charge (Section 7.1) — including removing the watermark or altering the licence check. The exceptions to reverse engineering in paragraph 2 above are not restricted by this paragraph;
  5. Use the Software for any unlawful purpose, or to infringe the rights of any third party (including copyright, portrait rights, rights of publicity, and privacy rights).

5. Third-Party Software and Open Source Licenses

  1. The Software includes third-party components licensed under the GPL, LGPL, Apache-2.0, MIT, and other open source licenses, as well as third-party components under proprietary licenses, such as Microsoft DirectML and the Microsoft Visual C++ Redistributable. A list of these components and their license terms is available in the Software under Help > About Daysta > Licenses. Components under proprietary licenses (such as DirectML) may not be extracted from the Software and redistributed on their own.
  2. Third-party components are licensed to you directly by their respective right holders under the applicable open source licenses, not by us. The license grant in Section 3 and the restrictions in Section 4 apply only to those parts of the Software in which we hold rights. Components governed by the GPL (such as the bundled FFmpeg executables) are included as separate programs aggregated with the Software.
  3. Notwithstanding anything in these Terms, the terms of the applicable license govern with respect to those third-party components. Nothing in Section 4 or elsewhere in these Terms limits the rights those licenses grant you, including any right to copy, modify, redistribute, or reverse engineer those components.
  4. Obtaining the Corresponding Source. The complete corresponding source code (including build scripts) for the GPL- and LGPL-licensed components bundled with the Software — including FFmpeg, libmpv, and the libraries built into those binaries — is available at no charge, for as long as we offer the Software, from:

https://github.com/nyarrow-studio/daysta-thirdparty-sources/releases

Source sets are published per version of the Software. The same directions are provided in the in-app license screen (Help > About Daysta > Licenses) and in text files bundled with the Software. In addition, we offer, for at least three (3) years from your receipt of the Software, to provide that source code for a charge no more than our cost of physically performing this distribution. Requests may be directed to the contact in Section 17.

  1. Libraries licensed under the LGPL (such as libmpv) are bundled as separate files, and you may, under the terms of the LGPL, replace them with your own modified versions for use with the Software.
  2. We provide no warranty for third-party components beyond what is provided by their respective licenses.

6. User Content and Responsibility for Clearing Rights

  1. You are solely responsible for clearing all rights in the videos, images, and music you load into the Software and in the outputs you create, including:
    • obtaining consent regarding the portrait and privacy rights of persons filmed;
    • clearing copyright and neighbouring rights in music you use;
    • obtaining permission to use any third-party works contained in your source material.
  2. If you publish or share an output video on social media or elsewhere, you are solely responsible for its lawfulness and for the consequences of that publication.
  3. Background music bundled with the Software is provided after we have verified our right to bundle and redistribute it. You remain responsible for clearing rights if you use that music separately, outside the Software.
  4. We do not access, collect, store, or transmit your User Content (see the Privacy Policy). Accordingly, we are not in a position to monitor or review User Content and we do not assess its lawfulness.

7. Paid Features, Purchases, and Refunds

  1. The Software is free to use, with certain features limited (a watermark applied to exported videos; caps on export resolution, output length, and the number of source videos; and the use of your own music files). These limits are removed by a one-time in-app purchase ("Premium") made through the store from which you obtain the Software (e.g. Microsoft Store).
  2. Sales transactions for the Software on the Microsoft Store are conducted through Microsoft in accordance with the store's terms. We are the licensor of the Software.
  3. Payment is processed by that store. We do not receive your credit card details or other payment information.
  4. Refunds are governed by the refund policy of that store. Please direct refund requests to the store. Except where that store's policy requires otherwise, we cannot issue refunds directly.
  5. For consumers in the EU/EEA: online purchases of digital content may carry a 14-day right of withdrawal under the Consumer Rights Directive (which lapses where you have expressly consented to immediate delivery by download and acknowledged that you thereby lose the right of withdrawal). The statutory withdrawal information is provided, and withdrawals are handled, by the store from which you purchased. Please follow that store's process.
  6. Nothing in this Section limits any statutory right of withdrawal or refund you may have in your jurisdiction.

8. Updates and Support

  1. We may provide updates to fix defects or to add or improve features, but we are under no obligation to provide updates at any particular frequency or for any particular period.
  2. Updates may change or remove existing functionality. Where we remove significant functionality, we will give advance notice where reasonably practicable (Section 2.5 applies to consumers in the EU/EEA).
  3. Support is provided through the channel we designate, to the extent we consider reasonable.

9. Disclaimer of Warranties

  1. The Software is provided "AS IS".
  2. To the maximum extent permitted by applicable law, we disclaim all warranties, express or implied, including warranties of merchantability, fitness for a particular purpose, non-infringement, accuracy, completeness, and continued availability.
  3. In particular, the Software performs automated analysis and editing of video, and we make no warranty as to which scenes are selected, the quality of the output video, the accuracy of automatically generated subtitles, or the accuracy of person recognition.
  4. You are responsible for protecting your own data. Except as provided in Section 10, we are not liable for loss of or damage to data arising from use of the Software. Please keep backups of important data.
  5. If you are a consumer under the Consumer Contract Act of Japan or equivalent legislation, nothing in this Section excludes or limits any liability of ours that cannot be excluded or limited by law (including liability for non-conformity of the Software, where provided for consideration, as to its kind or quality). If the Software has a material defect, we will endeavour to correct it by providing an update. See Section 7 regarding refunds where correction is not made within a reasonable period.
  6. If you are a consumer in the EU/EEA, the statutory conformity guarantee and remedies under the national laws implementing Directive (EU) 2019/770 on digital content and digital services (including bringing the content into conformity, price reduction, and termination) apply notwithstanding this Section, and no charge is made for those statutory guarantees.

10. Limitation of Liability

  1. Where our breach of contract or tort results from our ordinary negligence (that is, not from our wilful misconduct or gross negligence; the same applies below), we are not liable for indirect, special, consequential, or incidental damages, lost profits, lost data, or business interruption arising out of or relating to the Software or your inability to use it.
  2. Where our breach of contract or tort results from our ordinary negligence, our total aggregate liability is limited to the amount you actually paid as consideration for the Software (or JPY 1,000 if you use the Software free of charge).
  3. The exclusions and limitations in the two preceding paragraphs do not apply to damages caused by our wilful misconduct or gross negligence, to damages arising from death or personal injury, or to any liability that may not be excluded or limited under applicable law.
  4. If you are a consumer, nothing in this Section limits rights guaranteed to you by the consumer protection law of your country of residence.
  5. If you are a consumer in the EU/EEA, the limitations in this Section do not apply to damage that was foreseeable at the time the contract was concluded and that results from a breach of an obligation whose fulfilment is essential to achieving the purpose of these Terms (essential contractual obligations).

11. Indemnity

If a dispute with a third party arises from causes attributable to you (including your failure to clear rights in User Content), you will resolve it at your own cost and responsibility. If we suffer loss as a result, you will compensate us to the extent attributable to causes for which you are responsible.

12. Changes to and Discontinuation of the Software

  1. We may change what the Software offers, or discontinue it.
  2. If we discontinue the Software, we will give at least ninety (90) days' advance notice.
  3. If you made the one-time Premium purchase, you may continue to use the copy of the Software already installed on your device after discontinuation, with Premium features enabled; we will not disable it. However, updates and support will cease.

13. Privacy

Our handling of personal information and data in the Software is described in the Privacy Policy, which forms part of these Terms.

14. Governing Law and Jurisdiction

  1. These Terms are governed by and construed in accordance with the laws of Japan. However, if you are a consumer, this choice of law does not deprive you of the protection of any provision of the law of the country in which you habitually reside that cannot be derogated from by agreement (for customers in the EU/EEA, including the mandatory provisions applicable under Article 6(2) of the Rome I Regulation).
  2. If you use the Software for business purposes, the Tokyo District Court shall have exclusive jurisdiction as the court of first instance for any dispute arising out of these Terms.
  3. If you are a consumer, the Tokyo District Court shall have non-exclusive jurisdiction as the court of first instance for any dispute arising out of these Terms. Nothing in this paragraph deprives you of the right to bring proceedings in any court having jurisdiction under applicable law (including the courts of your place of residence), or affects the application of any mandatory provision of the law of your country of residence.

15. Severability, Entire Agreement, and No Waiver

  1. If any provision of these Terms, or part of one, is held invalid or unenforceable, the remaining provisions remain in full force and effect. The treatment of the invalid or unenforceable provision shall be as provided by applicable law.
  2. These Terms and the Privacy Policy constitute the entire agreement between you and us regarding the Software (other than third-party licenses that govern under Section 5).
  3. Our failure to exercise a right under these Terms is not a waiver of that right.

16. Governing Language

These Terms are prepared in Japanese and English. In the event of any discrepancy between the two versions, the Japanese version prevails. Versions in any other language are reference translations only and have no legal effect. However, if you are a consumer and obtained the Software on the basis of the English version, we will not rely on the Japanese version to assert an interpretation less favourable to you than the English text.

17. Contact

For questions about these Terms, and for source code requests under Section 5, please contact:

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