ECHO Steam End User License Agreement

For the ECHO desktop application distributed under Steam App ID 5105090.

Version 1.0 · Effective: 2026-08-15

This End User License Agreement ("EULA") applies to the ECHO edition distributed through Steam ("ECHO Steam"). It is separate from the ECHO Privacy Policy, Third-Party Notices, and Source-Available License.

1. Parties and Acceptance

This EULA is between you and the maintainer of ECHO operating under the public project name "Moekotori" (the "Licensor") for ECHO Steam. By downloading, installing, launching, or using ECHO Steam, you accept this EULA. If you do not accept it, do not use and uninstall ECHO Steam.

If you are not old enough to enter this EULA independently where you live, a parent or legal guardian must review and accept it. Nothing in this EULA limits consumer rights that cannot lawfully be waived. Your use of Steam is also governed by the Steam Subscriber Agreement and applicable Valve rules. Valve is not the licensor of ECHO under this EULA.

2. Limited License

While you comply with this EULA, hold a valid ECHO Steam license, and satisfy applicable Steam entitlement requirements, the Licensor grants you a limited, non-exclusive, non-transferable, non-sublicensable license to install, run, and use ECHO Steam through supported Steam accounts and devices for personal use and internal uses permitted by Steam.

This EULA grants a right to use the software. It does not transfer ownership of ECHO, its source code, branding, icons, interface, documentation, or other materials, and grants no rights in music, lyrics, artwork, Workshop content, or third-party service content.

3. Lawful Use and Restrictions

Unless this EULA, a separate applicable license, or law expressly permits it, you must not:

copy, sell, rent, sublicense, redistribute, publicly host, or provide ECHO Steam or its installer to third parties;
remove or alter copyright, trademark, attribution, security, integrity, entitlement, or diagnostic notices;
bypass Steam ownership, DLC, Pro entitlement, signature, integrity, or other access controls;
use ECHO Steam to infringe copyright, privacy, contract, access-control, or other legal rights;
use ECHO Steam, Steamworks, remote services, or Workshop content to distribute malware, obtain unauthorized access, or interfere with systems; or
use ECHO, Moekotori, Valve, Steam, or third-party names or marks to imply unconfirmed sponsorship, certification, or partnership.

This section does not restrict interoperability, audit, security research, reverse engineering, backup, or other rights that applicable law expressly permits and a contract cannot exclude. Source-code activities are separately governed by the ECHO Source-Available License; rights it expressly grants are not reduced by this EULA.

4. User Media, Remote Sources, and Third-Party Services

You are responsible for having the right to access, copy, organize, play, or display music, lyrics, artwork, playlists, and other content imported into ECHO Steam. ECHO provides playback and management tools; it does not grant a license to third-party media or guarantee that a use qualifies as fair use, private copying, or another exception.

When you configure WebDAV, Jellyfin, Emby, Subsonic/Navidrome, SMB, SSHFS, direct radio streams, Last.fm, Discord, OPRA, or another third-party service, you must follow that service's terms and are responsible for accounts, credentials, server addresses, and access permissions. The Licensor does not control continued third-party availability.

5. Steamworks, Purchases, Refunds, and Pro DLC

ECHO Steam downloads, updates, ownership checks, Steam Cloud, Rich Presence, achievements, stats, leaderboards, and Workshop features depend on the local Steam client and Valve services and may be unavailable because of Steam settings, account state, region, network conditions, service outages, or Valve rules.

Purchases, refunds, payments, and withdrawal rights through Steam are handled through Valve's transaction process, the Steam Refund Policy, and applicable law. This EULA does not reduce any refund or consumer right available under law or Steam rules.

ECHO Pro is unlocked in the same executable through DLC or another clearly identified Steam entitlement associated with the owning Steam account. A refund, revocation, loss of ownership, or inability to verify entitlement may lock Pro features, but does not remove base-edition data or rights that law requires to remain. You must not bypass or falsify entitlement checks.

6. Steam Cloud and Data

When Steam Cloud is available and enabled, ECHO Steam may synchronize an allowlisted projection of portable settings. The library, music files, absolute paths, playback history, device information, and credentials are excluded. See the ECHO Steam Privacy Policy for details.

This EULA does not turn optional processing into mandatory consent. Stats, leaderboards, third-party accounts, and other features requiring a separate choice must still be enabled through their corresponding settings.

7. Steam Workshop

Workshop items are provided by their authors and governed by the Steam Subscriber Agreement, Steam Workshop rules, the license shown on the item page, and applicable law. Except for ECHO-owned items, the Licensor does not claim ownership or grant rights beyond the item's license.

ECHO Steam validates, isolates, and limits Workshop capabilities, but cannot guarantee that all third-party content is accurate, suitable, continuously available, or defect-free. ECHO may reject, quarantine, disable, or stop applying damaged, incompatible, over-permissioned, or unsafe content. Subscription does not automatically enable an item.

If ECHO later opens public submissions, you may submit only content you own or may distribute and must accept Steam's required submission terms. Without separate express terms, this EULA does not grant ECHO an additional commercial license to your work.

8. Updates, Changes, and Support

Official ECHO Steam files are normally updated through Steam. Updates may address security, compatibility, defects, feature changes, or platform and legal requirements. Planned support is not a promise; only released versions and documentation describe current capability.

The Licensor may add, change, or remove future features, but an update will not retroactively remove acquired rights that applicable law makes non-waivable. Support, maintenance, online services, and compatibility are not guaranteed to remain permanent or uninterrupted. Additional acceptance will be requested where law requires it.

9. Third-Party Components and Separate Licenses

ECHO Steam includes third-party libraries, fonts, codecs, SDKs, and other components governed by their own licenses. Notices are provided in THIRD_PARTY_NOTICES.md and the licenses/ directory. A third-party license controls only for its corresponding component where it conflicts with this EULA.

10. Backups, Audio Devices, and Use Risk

Keep reasonable backups of your library, playlists, settings, and important files before importing, migrating, bulk editing, or clearing data. ECHO cleanup should not delete original music files, but file-system operations, remote services, hardware, drivers, and third-party tools can create data risk.

EQ, DSP, gain, exclusive output, ASIO, DSD/DoP, and experimental audio features may change volume, signal, or device behavior. Start at a safe level and follow manufacturer instructions. ECHO status does not replace hearing protection, hardware safety guidance, or professional advice.

11. Disclaimer of Warranties

To the extent permitted by law, ECHO Steam is provided "as is" and "as available," without a promise that it will be error-free, uninterrupted, suitable for a particular professional purpose, or compatible with every file, driver, device, server, or Workshop item. This does not exclude any statutory warranty, refund, repair, replacement, or other consumer remedy that cannot lawfully be excluded.

12. Limitation of Liability

To the extent permitted by law, the Licensor is not responsible for indirect or consequential loss that was not reasonably foreseeable. This EULA does not exclude or limit liability that law does not allow to be excluded or limited, including applicable liability for fraud, intentional misconduct, gross negligence, death or personal injury, or mandatory consumer obligations. You are not required to waive a non-waivable legal remedy.

13. Termination

You may stop using and uninstall ECHO Steam at any time. If you materially breach this EULA, the Licensor may terminate the license to the extent permitted by law and will provide notice or an opportunity to cure where required. After termination, stop using copies covered by the terminated license.

Non-terminable rights, existing consumer claims, and provisions that should survive—including ownership, third-party licenses, liability limits, and dispute provisions—remain unaffected. Steam accounts, purchases, and cloud data remain subject to Valve rules.

14. Changes to This EULA

The Licensor may update this EULA for future versions and will identify a new version and effective date. Material changes will receive reasonable notice and renewed acceptance where law requires. An update will not retroactively change terms governing an existing dispute or reduce mandatory consumer rights.

15. Applicable Law, Severability, and Entire Terms

This EULA is interpreted under laws applicable to the relationship between you and the Licensor. No choice-of-law or dispute arrangement deprives you of mandatory protection where you live or access to a court or regulator with mandatory jurisdiction.

If a provision is invalid or unenforceable, it is limited to the extent permitted and the rest remains effective. This EULA, the Privacy Policy, third-party licenses, and applicable Steam terms govern their respective subjects; conflicts are interpreted under applicable law, the specific subject, and non-waivable rights.

16. Contact

ECHO is maintained by Moekotori. For licensing or EULA questions, email nyafairy233@gmail.com.