Terms of Service

1. Agreement to Terms

These Terms of Service ("Terms") constitute a legal agreement between you ("User" or "you") and Daniel Zemen, sole entrepreneur ("Licensor," "we," "us," or "our"), governing your use of the ZettaSend website (zettasend.com), the ZettaSend desktop application, and all related services (collectively, the "Services" or "Software").

By accessing the website, registering an account, downloading the application, or using the Services, you acknowledge that you have read, understood, and agree to be bound by these Terms. If you do not agree, do not access or use the Services.

The ZettaSend desktop application is also governed by the End User License Agreement (EULA) displayed at installation. In the event of any conflict between these Terms and the EULA, the EULA shall prevail with respect to the desktop application.

2. Subscription Plans and Free Trial

ZettaSend offers the following subscription plans:

• Solo Plan — for individual users. Includes all file transfer features for a single user.
• Team Plan — for organizations. Includes workspace management, team member seats, audit logging, branding, and centralized administrative controls. The number of seats is determined by the subscription quantity purchased.

Seat Definition: A "seat" is a user account assigned to a Team workspace. Each seat allows one team member to use ZettaSend under the workspace's subscription. The Team plan administrator manages seat assignments and may reassign seats between users.

30-Day Free Trial: A 30-day free trial is available for both plans. No credit card is required to start the trial. During the trial period, you will not be charged and have full access to all features included in your selected plan. You may cancel the trial at any time without obligation. If you do not cancel before the trial ends, your subscription will automatically begin and you will be prompted to add a payment method to continue service.

Anti-Abuse: The free trial is limited to one trial per user. Creating multiple accounts or using other means to extend the trial period beyond 30 days is prohibited and may result in immediate account termination.

3. Account Responsibilities

You are responsible for maintaining the confidentiality of your account credentials and for all activities that occur under your account. You agree to:

• Provide accurate, current, and complete account information.
• Keep your password secure and not share it with third parties.
• Notify us immediately at [email protected] of any unauthorized use of your account.
• Ensure that all users accessing the Services through your Team plan have appropriate authorization.

4. Acceptable Use and Restrictions

ZettaSend is a peer-to-peer file transfer tool. You are solely responsible for the data you transmit or receive. You agree NOT to:

• (a) Reverse engineer, decompile, disassemble, or attempt to derive the source code of the Software;
• (b) Modify, adapt, or create derivative works of the Software;
• (c) Rent, lease, loan, sell, sublicense, distribute, or transfer your license to any third party;
• (d) Use the Services for any illegal, fraudulent, or unauthorized purpose;
• (e) Transmit viruses, malware, spam, or any material that violates applicable law or infringes third-party rights;
• (f) Circumvent or attempt to circumvent any access restrictions, authentication mechanisms, or subscription controls;
• (g) Use the Services in any manner that interferes with or disrupts the network or services of the Licensor or any third party;
• (h) Upload, share, distribute, or resell pre-compiled binaries obtained through a subscription.

Because ZettaSend utilizes end-to-end encryption, we do not monitor, store, or have access to your file transfers. You are solely responsible for ensuring that your use of the Services complies with all applicable laws, including data protection, intellectual property, and export control regulations.

5. Privacy and Data Protection

Your use of the Services is also governed by our Privacy Policy, which describes how we collect, use, and protect your personal data in accordance with the GDPR and Hungarian data protection law (Info Act).

For Team plan customers, a Data Processing Agreement (DPA) is available. You are responsible for ensuring that your use of the Services and any data you process through them complies with applicable data protection laws, including obtaining any necessary consents from data subjects whose data may be included in audit logs or file manifests.

6. Security

File transfers are secured with end-to-end encryption using the QUIC protocol with mutual TLS (mTLS). File contents are transferred directly between peers and are never stored on or readable by our servers. When direct peer-to-peer connections are not possible due to network restrictions, transfers may be routed through a fallback relay server; the relay server only forwards encrypted traffic and cannot decrypt or access the file contents.

Audit logging, when enabled, uses ECDSA P-256 digital signatures and SHA-256 hashing to provide cryptographically verifiable transfer records. Both the sender and receiver sign the transfer envelope, providing mutual non-repudiation.

While we implement commercially reasonable security measures, no method of electronic transmission or storage is 100% secure, and we cannot guarantee absolute security.

7. Payments and Subscriptions

Payments are processed securely via Stripe. We do not store your credit card or banking details. Subscriptions are billed on a monthly or annual basis, depending on your selected billing cycle.

Plan Changes and Proration: When you upgrade your plan, add seats, or switch to a longer billing interval (e.g., monthly to annual), changes take effect immediately and charges are prorated based on the remaining time in the current billing period. When you downgrade to a cheaper plan, reduce seats, or switch to a shorter billing interval (e.g., annual to monthly), the change takes effect at the end of the current billing period. Any applicable credits from downgrades are applied to future billing cycles.

EU Right of Withdrawal Waiver: Under EU consumer protection law (Directive 2011/83/EU) and Hungarian implementing legislation (Government Decree 45/2014 (II.26.)), consumers have a 14-day right of withdrawal for distance and off-premises contracts. However, this right does not apply to the supply of digital content which is not supplied on a tangible medium where the performance has begun with the consumer's prior express consent and acknowledgment that they thereby lose their right of withdrawal. By completing checkout and downloading or accessing the Software, you explicitly consent to the immediate performance of the contract and acknowledge that you lose your right of withdrawal.

For refund information, please see our Refund Policy.

8. Service Availability

We strive to maintain high availability of our coordination, authentication, and audit services, but we do not guarantee uninterrupted or error-free operation. The Services may be temporarily unavailable for scheduled maintenance, emergency repairs, or events beyond our reasonable control. We are not liable for any damages resulting from service interruptions, delays, or unavailability.

9. Intellectual Property

The Software, including all code, design, graphics, logos, trademarks, and documentation, is the exclusive property of Daniel Zemen and is protected by copyright, trademark, and other intellectual property laws. These Terms do not transfer any ownership rights to you. The Software may include open-source components distributed under their respective licenses.

10. Export Control

The Software includes cryptographic functionality using ECDSA (NIST P-256), TLS 1.3, SHA-256, and related technologies. It may be subject to export control laws and regulations, including but not limited to applicable EU dual-use export controls. You represent and warrant that you are not located in, under the control of, or a national or resident of any country subject to embargo or sanctions. You agree to comply with all applicable export and import laws.

11. Disclaimer of Warranties

THE SOFTWARE AND SERVICES ARE PROVIDED "AS IS" AND "AS AVAILABLE," WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT, AND TITLE. WE DO NOT WARRANT THAT THE SOFTWARE WILL MEET YOUR REQUIREMENTS, OPERATE WITHOUT INTERRUPTION, BE ERROR-FREE, OR THAT ANY DEFECTS WILL BE CORRECTED. YOUR SOLE REMEDY FOR DISSATISFACTION WITH THE SOFTWARE IS TO DISCONTINUE USE.

12. Limitation of Liability

TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, IN NO EVENT SHALL DANIEL ZEMEN BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, PUNITIVE, OR CONSEQUENTIAL DAMAGES, INCLUDING BUT NOT LIMITED TO LOSS OF DATA, LOSS OF PROFITS, LOSS OF REVENUE, BUSINESS INTERRUPTION, OR PROCUREMENT OF SUBSTITUTE SERVICES, ARISING OUT OF OR IN CONNECTION WITH THESE TERMS OR THE USE OF THE SOFTWARE, WHETHER BASED ON CONTRACT, TORT, STRICT LIABILITY, OR ANY OTHER LEGAL THEORY, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

IN NO EVENT SHALL THE LICENSOR'S TOTAL AGGREGATE LIABILITY FOR ALL CLAIMS ARISING OUT OF OR RELATED TO THESE TERMS EXCEED THE SUBSCRIPTION FEES ACTUALLY PAID BY YOU TO THE LICENSOR IN THE TWELVE (12) MONTHS IMMEDIATELY PRECEDING THE EVENT GIVING RISE TO THE CLAIM.

This limitation does not apply to liability for personal injury caused by negligence, or for any other liability that cannot be excluded or limited under applicable Hungarian or EU law.

13. Indemnification

You agree to indemnify, defend, and hold harmless Daniel Zemen from and against any and all claims, damages, losses, liabilities, costs, and expenses (including reasonable legal fees) arising out of or related to: (a) your use of the Services in violation of these Terms or applicable law; (b) any data or content you transmit using the Services; or (c) any third-party claim arising from your use of the Services.

14. Termination

You may terminate your account at any time by ceasing all use of the Services and contacting us at [email protected] for account deletion. We may terminate or suspend your access immediately, without prior notice or liability, for any breach of these Terms.

Upon termination, your right to use the Software shall immediately cease. Provisions that by their nature should survive termination shall survive, including Sections 9 through 13.

15. Changes to These Terms

We reserve the right to modify these Terms at any time. If we make material changes, we will notify you through the Services or by other reasonable means. Your continued use of the Services after the effective date of any changes constitutes your acceptance of the revised Terms. If you do not agree to the changes, you must discontinue use of the Services.

16. General Provisions

These Terms constitute the entire agreement between you and Daniel Zemen regarding the Services. If any provision is held invalid or unenforceable, the remaining provisions shall remain in full force and effect. Our failure to enforce any right or provision shall not constitute a waiver. You may not assign or transfer these Terms without our prior written consent. These Terms shall be governed by and construed in accordance with the laws of Hungary.

17. Contact

If you have any questions about these Terms, please contact us at: