Terms & Conditions

End-User License Agreement & Terms of Service

Effective date: [DATE] · Version 1.0

1. Acceptance of these Terms

These End-User License Agreement and Terms of Service (the "Terms") form a binding agreement between you ("you", "User") and PliusC3 governing your download, installation, and use of the PliusC3 application and related services (together, the "App" or "Service").

By installing, accessing, or using the App, you confirm that you have read, understood, and agree to be bound by these Terms and by our Privacy Policy, incorporated by reference. If you do not agree, do not install or use the App.

The App may be distributed via app stores or by direct download ("sideload"). Where an app store's terms also apply, those terms are between you and the store operator.

2. Definitions

• pliusc3 identity / pliusc3Id - the device-bound cryptographic identity that identifies you. There is no username, email, or phone number account.
• Passcode / PIN - the secret you set to unlock the App and derive the encryption keys protecting your local data.
• Content - messages, calls, files, media, notes, calendar entries, status updates, and other data you create, send, receive, or store.
• End-to-end encryption (E2E) - encryption under which only the communicating devices hold the keys needed to read Content; the Provider and its infrastructure do not.
• Relay / signaling server - infrastructure that helps devices discover each other and forwards encrypted data without the ability to read Content.

3. Licence grant and restrictions

Subject to these Terms, we grant you a limited, personal, non-exclusive, non-transferable, non-sublicensable, revocable licence to install and use the App on devices you own or control, for your own lawful use.

You must not: copy or modify the App except as permitted by law; reverse engineer it except where that restriction is prohibited by law; rent, lease, sell, or redistribute it without our consent; remove proprietary notices; circumvent security, rate-limiting, or authentication; use it to build a competing product or to scrape/overload the Service; or use automated access except as permitted.

The App is licensed, not sold. We and our licensors retain all intellectual-property rights.

4. Eligibility

You must be at least [16] years old (or the minimum age of digital consent in your country). If under the age of majority, you may use the App only with the consent and supervision of a parent or guardian who agrees to these Terms. You must not use the App if barred under applicable law, including sanctions or export-control laws (see §13).

5. Your identity, passcode, and data recovery

No account, device-bound identity. The App requires no email, phone number, or traditional account. Your identity is generated on and bound to your device.

You are responsible for your passcode and device. Your Content and keys are protected by your Passcode and device security. We cannot recover, reset, or bypass your Passcode.

Irrecoverable data - read carefully. Because only you hold your keys, if you forget your Passcode, wipe the App, lose your device, or trigger a destructive/duress wipe, your Content and identity are permanently and irrecoverably lost. We have no ability to restore them. You are solely responsible for any backups and for safeguarding your device and Passcode.

Duress / burn features. The App may offer features that intentionally and irreversibly destroy local data. You are responsible for using them carefully; we are not liable for data destroyed by your use of them.

6. The Service and how encryption works

End-to-end encryption. Messages, calls, and transfers are protected with modern, post-quantum-capable end-to-end encryption. In ordinary operation, we and our infrastructure do not have access to the plaintext of your Content or your private keys.

What our servers handle. Our relay/signaling infrastructure forwards encrypted data between devices and may briefly store encrypted, undelivered messages for later delivery. Such stored data is ciphertext and is automatically purged after a short retention period. Details are in the Privacy Policy.

No guarantee of absolute security. No system is perfectly secure. We do not warrant that the App cannot be compromised - through vulnerabilities, a compromised or malicious device, malware, coercion, seizure, or user error. Encryption cannot protect a device that is already compromised or unlocked. You are responsible for keeping your device and OS secure and up to date.

No lawful-interception backdoor. The App is not designed to give us the technical means to read your Content, so we cannot produce plaintext Content in response to any request - we do not have it.

7. Acceptable use

You are solely responsible for your Content and conduct. You agree not to use the App to: violate any law or the rights of others; create, store, or transmit illegal content (including child sexual abuse material, or content inciting violence or terrorism); distribute malware or attempt unauthorized access; infringe intellectual-property or privacy rights; send spam or impersonate others; or interfere with or overload the Service.

Content moderation limits. Because Content is end-to-end encrypted, we generally cannot see, monitor, moderate, or remove the Content you send or store. Responsibility rests entirely with the Users who create and share it. Nothing here obliges us to monitor Content, and we do not.

Enforcement. Where we become aware of prohibited use of our infrastructure, we may take proportionate technical measures - including rate-limiting, blocking, or revoking access - without access to your Content.

8. Your Content

You retain all rights in your Content; we do not claim ownership. You grant us only the narrow technical licence needed to transmit, route, and briefly cache the encrypted form of your Content so the Service can function. This licence does not permit us to read, use, sell, or disclose plaintext, and it ends when the encrypted data is delivered or purged. You represent that you have the necessary rights to your Content.

9. Privacy and data protection

Our handling of personal data is described in the Privacy Policy. The App minimizes data: no email/phone account is required; message Content is E2E encrypted and not readable by us; server-side metadata is minimized and short-lived. Where the GDPR applies, we act as controller only for the limited operational data we process, and you retain your rights under applicable law - noting we cannot act on data we do not hold or cannot read.

10. Third-party services and infrastructure

The App may rely on third-party components and infrastructure (e.g., NAT-traversal/relay servers for calls, the operating system, and the store or hosting used to distribute the App), which may have their own terms. We are not responsible for third-party services we do not control. The App may interoperate with separate applications we publish (for example, a standalone "Daily Planner" app), which may have their own terms.

11. Updates and changes to the App

The App may check for and offer updates, delivered directly ("OTA") over a secured channel. Updates are not installed silently - you choose to install them. We may add, change, or remove features over time; some updates may be required for continued security or functionality. The Service is provided on an "as available" basis and may be modified, suspended, or discontinued, subject to applicable law.

12. Fees, purchases, and refunds

The App or certain features may be free or paid, one-time or by subscription, as described at the point of purchase. [Complete to match your actual pricing, billing, auto-renewal, and cancellation terms.] Where you purchase through an app store, billing, renewals, and refunds follow that store's policies. EU consumers may have a statutory right of withdrawal for digital purchases - [state how it applies, including any consent to immediate performance that waives it].

13. Export controls and sanctions

The App contains strong encryption and may be subject to export-control and sanctions laws. You represent that you are not located in, and will not use or export the App in violation of, any applicable embargo or restriction, and that you are not on any restricted-party list.

14. Disclaimers of warranty

To the maximum extent permitted by law, the App and Service are provided "as is" and "as available", without warranties of any kind, express, implied, or statutory, including merchantability, fitness for a particular purpose, non-infringement, and any warranty that the Service will be uninterrupted, secure, error-free, or that messages will always be delivered. Nothing excludes rights that cannot lawfully be excluded, including mandatory EU/Lithuanian consumer-protection rights.

15. Limitation of liability

To the maximum extent permitted by law, we are not liable for indirect, incidental, special, consequential, or punitive damages, or for loss of data, profits, goodwill, or business interruption. In particular, we are not liable for loss of Content or identity resulting from a forgotten Passcode, lost or compromised device, malware, or use of destructive features (see §5). Our total aggregate liability is limited to the greater of the amount you paid us in the [12] months before the event or [EUR 50]. Nothing limits liability for death or personal injury caused by negligence, for fraud, or for any liability that cannot be limited under applicable law.

16. Indemnification

To the extent permitted by law, you agree to indemnify and hold us harmless from claims, damages, and costs (including reasonable legal fees) arising from your Content, your use of the App in breach of these Terms, or your violation of law or third-party rights.

17. Suspension and termination

You may stop using the App at any time and uninstall it; doing so may permanently destroy your local Content and identity (see §5). We may suspend or terminate your access to the Service if you materially breach these Terms or misuse it, subject to applicable law. Sections that by their nature should survive termination continue to apply.

18. Governing law and disputes

These Terms are governed by the laws of [Lithuania], except where mandatory consumer-protection law in your country of residence provides otherwise. The courts of [Lithuania] have jurisdiction; if you are a consumer, you may also bring proceedings in your country of residence, and mandatory local protections continue to apply. EU consumers may also use the EU Online Dispute Resolution platform.

19. Changes to these Terms

We may update these Terms from time to time. For material changes, we will provide reasonable notice (in-app or on pliusc3.net). Continued use after changes take effect constitutes acceptance. If you do not agree, stop using the App.

20. General

These Terms and the Privacy Policy are the entire agreement regarding the App and supersede prior agreements on that subject. If any provision is unenforceable, the rest remain in effect. Our failure to enforce a right is not a waiver. You may not assign these Terms without our consent; we may assign them in a merger, acquisition, or sale of assets. Questions: sayhello@pliusc3.net.

This document is a draft template and does not constitute legal advice. It will be finalized with qualified legal counsel before it is relied upon.