ShrinkCheck Terms of Use (EULA)

Last updated: November 14, 2026

These terms are an agreement between atelier-flare ("we", "us") and every user ("you") of the macOS application "ShrinkCheck" (named CmpfsCheck through version 0.9.x; the "Software"). By installing, launching, or using the Software, you agree to these terms.

This is an English translation provided for convenience. If there is any discrepancy between this translation and the Japanese version, the Japanese version prevails.

1. License

Subject to these terms, we grant you a non-exclusive, non-transferable right to use the Software free of charge. You may install and use it on any number of Macs that you own or manage, for personal or business use.

You do not need to purchase a license key or register as a user to use the Software.

2. Restrictions

You must not do any of the following. If we find a violation, we may revoke your right to use the Software.

Redistribute, resell, lend, sublicense, rent, or lease the Software's binaries or installers to a third party
Decompile, disassemble, or reverse engineer the Software, or otherwise attempt to obtain its source code, except to the extent expressly permitted by applicable law (for example, to achieve interoperability)
Circumvent or disable the safety suspension described in Section 6 (suspension of compression by the self-check or by stop notices), or distribute modified versions
Use the Software for unlawful purposes or with intent to damage another party's systems or data, or remove or alter the Software's name, copyright notices, or trademark notices

3. Copyright and Intellectual Property

All copyrights, trademarks, and other intellectual property rights in the Software and its related materials belong to us or to their rightful owners. These terms grant you a right to use the Software and do not transfer any intellectual property rights.

4. Disclaimer of Warranties and Limitation of Liability

The Software rewrites data on your file system. We take extensive safety measures (atomic replacement during compression, integrity verification, preservation of the original file, and others), but we do not guarantee correct operation in every environment or condition.

The Software is provided "AS IS". We make no warranty, express or implied, of fitness for a particular purpose, merchantability, non-infringement, error-free or uninterrupted operation, or any particular result.

We strongly recommend backing up important data, for example with Time Machine, before using the Software.

The Software uses the transparent compression mechanism of Apple's macOS (decmpfs). If changes Apple makes to the OS interfere with the Software, we will make reasonable efforts to respond, but we do not guarantee that our response will be complete or immediate.

Except in cases of our willful misconduct or gross negligence, our liability for damages arising from or related to your use of the Software is limited to direct and ordinary damages, and we are not liable for damages arising from special circumstances, lost profits, or loss of data. This limitation does not apply to the extent it is not permitted by the Consumer Contract Act of Japan or other applicable laws.

5. Updates and Support

We may provide updates that improve the Software or fix defects, but we are under no obligation to do so. Version 1.0.0 and later of the Software may communicate with our server to check for a newer version and for the stop notices described in Section 6 (see the Privacy Policy for details).

We accept support requests by email at [email protected]. Because the Software is provided free of charge, we do not guarantee the content, timing, or duration of our replies.

6. Safety Suspension and End of Availability

Because the Software depends on file system features of the OS, a change to the OS or a newly discovered defect could put your files at risk. To guard against this, version 1.0.0 and later of the Software includes the following mechanisms.

Self-check: For each combination of OS version and Software version, the Software confirms that compression and decompression work correctly, using test files that it creates itself. Compressing new files is unavailable until the self-check passes.
Stop notices: When we judge it necessary for safety, we may suspend the compression of new files for specific versions of the Software, including specific combinations with OS versions.

Only the compression of new files is suspended. Decompressing files that are already compressed and viewing your registered items and history remain available during a suspension. Files that are already compressed remain readable and writable through the OS regardless of the state of the Software.

We may end distribution or availability of the Software without prior notice. Our liability for any damage arising from a suspension or from the end of availability is governed by Section 4.

7. Termination

If you violate these terms, we may revoke your right to use the Software without notice. When your right to use the Software ends, you must stop using it and delete all copies in your possession. Sections 2 (Restrictions), 3 (Copyright and Intellectual Property), and 4 (Disclaimer of Warranties and Limitation of Liability) survive termination.

8. Third-Party Software

The Software may include open source software provided by third parties. Each such component is subject to its own license terms. See the "Credits" display in the app or the bundled NOTICES file for details.

9. Privacy

The handling of user data by the Software is governed by the separate Privacy Policy. The Software does not send your personal information or the contents of the files it compresses to our servers.

10. Governing Law and Jurisdiction

These terms are governed by and construed in accordance with the laws of Japan. The Tokyo District Court has exclusive jurisdiction as the court of first instance over any dispute between you and us relating to these terms or the Software.

11. Changes to These Terms

We may revise these terms as needed. We will announce significant changes on this page. Revised terms take effect when they are posted on this page. By continuing to use the Software after a revision, you agree to the revised terms.

12. Contact

For questions about these terms or anything else, please contact us by email.

Contact: [email protected]

Statutory information such as the operator's name and address is disclosed individually when needed, for example when you are considering a commercial agreement or requesting deletion of data.