Terms of Use

These Terms of Use ("Terms"), together with our Privacy Policy and the Data Processing Addendum, constitute the complete agreement ("Agreement") between Ohrus Labs - Service, Lda ("Ohrus", "we", "us", or "our") and you ("you" or the "User"), regarding access to and use of the Ziett platform.

By creating an account or using any service made available through the Ziett platform, you declare that you have read, understood, and fully agree to these Terms.

If you do not agree to these Terms, you must not use the platform.

1. About Ohrus and the Ziett Product

Ohrus Labs - Service, Lda (TIN: 5002714485), headquartered in Luanda, Angola, is the legal entity responsible for the development, operation, and delivery of services available through the Ziett platform.

Ziett is an Ohrus product — a unified multichannel communications platform that enables the sending and management of digital messages across multiple channels (SMS, WhatsApp, Telegram, Push notifications, and others).

All references to "Ziett" in this document refer to the product and platform. All legal obligations, liabilities, and commitments are assumed by Ohrus as the legal service provider.

Ohrus is authorised by the Angolan Data Protection Agency to process personal data, under APD Authorisation No. 682422756000/2026, issued on 3 June 2026.

2. Definitions

For the purposes of these Terms, the following expressions have the meanings indicated:

Ohrus — Ohrus Labs - Service, Lda, the legal entity responsible for the Ziett platform.

Ziett Platform or Platform — The technological system developed and operated by Ohrus that enables the sending and management of multichannel digital communications, including the website, web application, APIs, SDKs and associated services, accessible at https://ziett.co.

User — Any individual who creates a personal account on the Platform to access and use its services. A User always represents an identifiable human being with unique login credentials.

Billing Account — An entity (individual or corporate) registered on the Platform as the financial and legal party responsible for operations carried out. Billing, credit management, message sending, and accountability for any breach are all handled through the Billing Account.

Organization — A defined workspace within the Platform, linked to a Billing Account, grouping contacts, campaigns, messages, senders, and other operational resources.

Recipient — An individual or entity that receives messages sent through the Platform.

Message — Any communication sent through the Platform, including SMS, WhatsApp messages, Telegram messages, and Push notifications.

Content — Any text, data, files, images, or other material submitted, uploaded, or transmitted through the Platform by a User or Billing Account.

Providers — Third parties that supply the communications infrastructure used by Ohrus for Message delivery, including telecommunications operators (such as Unitel and Africell) and messaging platforms.

Services — The set of features made available by the Platform, including: sending SMS, WhatsApp, Telegram, and Push messages; contact management; campaign creation and scheduling; sender management; access to dashboards and analytics reports; APIs and SDKs; integration with external systems.

API — The programming interface made available by Ohrus for integrating the Platform with external systems.

Registration Country — The country indicated at the time of Billing Account creation, which determines the applicable tax and legal framework for that account.

Applicable Data Protection Laws — The set of personal data protection legislation applicable to data processing under these Terms, including, depending on the relevant jurisdiction: the Angolan Personal Data Protection Law (Law No. 22/11 of 17 June — "LPDP"); the European Union General Data Protection Regulation (EU Regulation 2016/679 — "GDPR"), applicable to processing involving data subjects residing in the European Economic Area; Brazil's General Data Protection Law (Law No. 13.709/2018 — "LGPD"), applicable to processing involving data subjects residing in Brazil; and any other mandatory national data protection legislation of any jurisdiction where the Platform is used or where Recipients reside.

Data Processing Addendum or DPA — A supplementary agreement to these Terms governing the processing of personal data by Ohrus as a subprocessor, as required by Applicable Data Protection Laws, available at ziett.co/legal/dpa.

3. Acceptance of Terms

3.1 By creating an account on the Platform, explicitly accepting these Terms, or using any feature of the Services, you agree to be fully bound by these Terms.

3.2 If you are acting on behalf of a company or other legal entity, you declare that you have the legal authority to bind that entity to these Terms. In that case, references to "you" in this document include that entity.

3.3 Use of the Platform requires legal majority (18 years of age or older) or equivalent legal capacity to enter into binding contracts.

3.4 Ohrus reserves the right to refuse access or cancel accounts, at its sole discretion, including where it suspects false information, fraudulent activity, or violation of these Terms.

4. User Accounts

4.1 Account Creation

To use the Platform, you must create a User Account by providing:

• Name — may be a fictitious name or alias;
• Valid email address — used for authentication, notifications, and Ohrus communications;
• Password — created by the User.

The User Account represents an individual's access to the Platform and identifies who performs actions within the system.

4.2 User Responsibilities

You are responsible for:

• Keeping your login credentials confidential;
• All actions carried out under your account, including actions by third parties to whom you have granted access;
• Immediately notifying Ohrus if you become aware of any unauthorised access to your account, by contacting support@ziett.co.

Ohrus will not be liable for any damages or losses resulting from unauthorised use of your account due to your own negligence.

4.3 Accuracy of Information

You agree to keep your account information up to date and accurate. Providing false or outdated information may result in immediate account suspension or termination.

5. Billing Accounts

5.1 What is a Billing Account

The Billing Account is the central entity of legal and financial responsibility on the Platform. All billing operations, credit management, and message sending are handled through it.

A Billing Account may represent an individual or a legal entity (company).

5.2 Required Information

Unlike the User Account, the Billing Account requires accurate legal information:

• Full legal name — full name of the individual or company's corporate name;
• Display name (alias) — name used internally on the Platform;
• Tax Identification Number (TIN/NIF);
• Billing email address;
• Contact phone number;
• Registration Country — set at the time of creation and determines the applicable tax framework.

This information is used exclusively for issuing tax documents (invoices and equivalents) and for compliance with legal obligations.

5.3 Members and Access Levels

A Billing Account may have multiple members with differentiated access levels. Members can collaboratively manage account resources, including:

• Management of SMS and other channel senders;
• Administration of payments and credits;
• Management of linked Organizations;
• Monitoring of sends and reports.

The Billing Account is responsible for all actions carried out by its members on the Platform, regardless of each member's access level.

5.4 Legal and Financial Responsibility

The Billing Account is the entity held responsible for:

• All Message Content sent through the Organizations linked to it;
• All costs incurred during the association period with each Organization;
• Any damages, legal violations, or breaches of these Terms committed during its tenure as the associated account;
• Compliance with all applicable laws relating to the sending of digital communications.

5.5 Change of Billing Account

When an Organization is transferred to a new Billing Account:

• The new Billing Account assumes responsibility for all operations from the moment of transfer;
• The previous Billing Account retains responsibility for all operations carried out during the period it was the associated account. Those records are preserved and may be consulted in the event of non-compliance or investigation;
• All Organization resources (contacts, campaigns, messages, templates, senders) are automatically transferred to the new Billing Account.

6. Organizations

6.1 Role of Organizations

An Organization is a defined workspace within the Platform. It functions as an operational scope grouping:

• Contact lists;
• Campaigns;
• Sent and received messages;
• Message templates;
• Configured senders;
• API integrations.

Resources are isolated between different Organizations, ensuring privacy and operational separation.

6.2 Link to Billing Account

Every Organization is mandatorily linked to a single Billing Account. An Organization cannot operate without a valid and active associated Billing Account.

All operations carried out during the association period — including message sending, contact creation, and campaign execution — are the responsibility of the current Billing Account.

6.3 Resource Ownership

All resources within an Organization are the legal property of the associated Billing Account. In the event of a transfer to a new Billing Account, ownership of those resources is automatically transferred to the new account.

7. Platform Services

Ohrus makes the following services available through the Ziett Platform:

• Sending transactional and marketing messages (SMS, WhatsApp, Telegram, Push);
• Contact list management;
• Campaign creation and scheduling;
• Message template creation and management;
• Sender configuration by channel;
• External system integration via API and SDK;
• Management of multiple Organizations;
• Collaborative management of Billing Accounts;
• Monitoring of metrics, reports, and analytics.

Ohrus uses a network of Providers for Message delivery. Service availability may partly depend on these third parties, including telecommunications operators and messaging platforms.

8. Message Sending and Content

8.1 Content Responsibility

You are solely responsible for all Message Content you send through the Platform, including its legality, accuracy, appropriateness, and compliance with applicable laws.

Ohrus does not review, validate, or assume responsibility for Message Content sent by Users or Billing Accounts.

8.2 Recipient Consent

By using the Platform to send messages, you declare and warrant that:

• You have obtained the explicit and valid consent of each Recipient for the types of messages you will send, in compliance with Applicable Data Protection Laws governing the Recipient's jurisdiction;
• You have a legitimate legal basis for contacting each Recipient, including, as applicable: express consent (GDPR, LGPD, LPDP), duly substantiated legitimate interest, or a pre-existing contractual relationship;
• You comply with the acceptable use policies of the messaging platforms used (Meta/WhatsApp Business Policy, Telegram, and others);
• You comply, where applicable, with anti-spam and electronic communications legislation in the Recipients' jurisdiction, including the CAN-SPAM Act (USA), the ePrivacy Directive (EU/EEA), CASL (Canada), and national equivalents.

8.3 Contact Registration

When importing or registering contacts on the Platform, you declare and warrant that:

• You are legally authorised to use those contacts' data for digital communication purposes;
• The data was collected lawfully and with the appropriate consent of the data subjects;
• Sending messages to those contacts does not violate any privacy rights, data protection laws, or other applicable legal provisions.

8.4 Unsolicited Communications

All unsolicited communications sent through the Platform are the exclusive responsibility of the Billing Account that sent them. Ohrus is not responsible for unsolicited communications (spam) and reserves the right to immediately suspend accounts that send such communications.

8.5 Monitoring

Ohrus reserves the right, but not the obligation, to monitor Content sent through the Platform to verify compliance with these Terms and applicable law. Ohrus may block, reject, or remove messages that violate these Terms, without prior notice.

9. Acceptable Use

9.1 General Obligations

You agree to use the Platform in a legal, ethical, and responsible manner, in accordance with these Terms and all applicable laws and regulations.

9.2 Prohibited Uses

It is expressly prohibited to use the Platform to:

• Send spam, unsolicited bulk messages, or unauthorised communications;
• Send false, misleading, fraudulent, or deceptive content;
• Send illegal, defamatory, obscene, abusive, threatening, or offensive content;
• Harass, intimidate, or discriminate against individuals on any grounds;
• Distribute malware, viruses, malicious code, or links to harmful software;
• Attack the Platform's infrastructure (DDoS, code injection, scraping, vulnerability exploitation);
• Attempt to gain unauthorised access to systems, accounts, or third-party data;
• Violate data protection, privacy, or telecommunications laws;
• Conduct or facilitate any illegal activity;
• Use the API for unauthorised or unintended purposes.

9.3 Suspension for Violation

Ohrus may immediately and unilaterally suspend or terminate accounts that violate these provisions. In serious cases, Ohrus reserves the right to report the activity to competent authorities.

10. Privacy and Data Protection

10.1 Ohrus's Commitment

Ohrus is committed to protecting the personal data of Users, Billing Accounts, and their Recipients, in accordance with Applicable Data Protection Laws.

Ohrus is authorised in Angola under APD Authorisation No. 682422756000/2026. For clients and recipients in other jurisdictions, Ohrus acknowledges and respects applicable local legislation, including the GDPR for data subjects in the EU and EEA, and the LGPD for data subjects in Brazil. Processing of international clients' data is governed by the Data Processing Addendum (DPA).

For a full description of data processing practices, see our Privacy Policy.

10.2 What we do with your data

Ohrus uses Users' and Billing Accounts' data exclusively to:

• Operate, maintain, and improve the Platform;
• Process transactions and issue tax documents;
• Communicate news, updates, alerts, and relevant service information;
• Comply with legal and regulatory obligations;
• Detect and prevent fraud, abuse, or security breaches.

10.3 What we do not do with your data

Ohrus commits to:

• Not reselling, renting, or commercialising any data from Users, Billing Accounts, Organizations, or Recipients;
• Not sharing data with commercial partners for third-party marketing purposes;
• Not using clients' contacts for Ohrus or Ziett marketing campaigns;
• Not using any client data for its own benefit beyond what is necessary for the provision of Services.

10.4 Sharing Necessary for Service Delivery

Ohrus may share data only to the extent strictly necessary for the provision of Services, namely:

Ohrus contractually requires all subprocessors to comply with data protection obligations under Applicable Data Protection Laws, including the obligation not to disclose data to other recipients and to destroy or return it at the end of the contractual relationship.

10.5 Internal Access

Ohrus may access account information only when necessary to:

• Provide technical support requested by the client;
• Comply with legal obligations or court orders;
• Respond to competent authority investigations;
• Prevent fraud, abuse, or security risks.

10.6 Data Retention

Data is retained for the duration of the contractual relationship with the data subject. Following account closure, data is deleted or anonymised, unless there is a legal obligation to retain it.

For full details on personal data processing, see our Privacy Policy.

11. Ohrus Communications

By creating a User Account or Billing Account, you agree to receive communications from Ohrus, including:

• Operational and security notifications related to your account;
• Service status alerts and scheduled maintenance notices;
• Information about new features, updates, and Platform improvements;
• Informational and educational materials about Platform use.

These communications are sent to the email address associated with the User Account or Billing Account.

You may manage your communication preferences in your account settings or by contacting support@ziett.co.

12. Pricing, Credits, and Payments

12.1 Pricing Model

Use of the Services may be subject to payment, based on per-message pricing models, subscription plans, or other models made available by Ohrus. Prices vary according to the communication channel and selected plan.

Current prices are available at https://ziett.co.

12.2 Credits and Billing

Credits and billing operations are managed exclusively at the Billing Account level. All invoicing is issued in compliance with the tax legislation of the Billing Account's Registration Country.

12.3 Price Changes

Ohrus reserves the right to change its prices at any time. Any changes will be communicated with reasonable notice via the website and/or email. Continued use of the Platform after changes take effect constitutes acceptance of the new prices.

12.4 Payment Methods

Payments may be made through the methods available on the Platform, including online payment and bank transfer.

12.5 No Refund

Unless otherwise required by law or expressly agreed by Ohrus, payments made are non-refundable, including unused credits.

13. APIs and Integrations

13.1 Availability

Ohrus makes APIs and SDKs available that allow integration of the Platform with external systems. API access is subject to these Terms and the technical documentation available at https://ziett.co/docs.

13.2 Legitimate Use

You agree to use the APIs and SDKs only for legitimate purposes and in accordance with the technical documentation provided by Ohrus.

13.3 Prohibited Actions

It is expressly prohibited to:

• Attack the API, including denial-of-service attacks (DoS/DDoS);
• Attempt to exploit API or Platform vulnerabilities;
• Scrape or mass-extract data;
• Use the API to compromise the Platform's security or availability.

14. Service Availability

14.1 Availability Efforts

Ohrus will make reasonable efforts to ensure high Platform availability. However, it does not guarantee that the Services will be:

• Available without interruption or failure;
• Free from technical errors or inaccuracies;
• Available at all times without scheduled or emergency maintenance.

14.2 Third-Party Dependency

Message delivery also depends on external factors beyond Ohrus's control, including:

• Availability and network quality of telecommunications operators;
• Availability of messaging platforms (Meta/WhatsApp, Telegram, etc.);
• Connectivity and status of Recipients' devices.

Ohrus does not guarantee Message delivery and is not responsible for delivery delays or failures resulting from external factors.

15. Intellectual Property

15.1 Ohrus's Property

All content on the Ziett Platform — including, without limitation, software, source code, design, interface, logos, trademarks, documentation, APIs, SDKs, and any creative materials — is the exclusive property of Ohrus Labs - Service, Lda or its licensors, and is protected by applicable intellectual property laws.

15.2 Prohibitions

It is expressly prohibited, without prior written authorisation from Ohrus, to:

• Copy, reproduce, modify, or create derivative works of the Platform or its content;
• Redistribute, sublicense, or commercially exploit any part of the Platform;
• Remove or alter any copyright notices, trademarks, or other proprietary notices.

15.3 Client Data Ownership

You retain ownership of all data you provide to the Platform, including contact lists, Message Content, and Billing Account data. Ohrus claims no proprietary rights over such data.

By using the Services, you grant Ohrus a limited, non-exclusive, and revocable licence to process, transmit, and use that data exclusively for the purpose of providing the Services.

16. Limitation of Liability

16.1 General Disclaimer

TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, OHRUS SHALL NOT BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, OR PUNITIVE DAMAGES, INCLUDING, WITHOUT LIMITATION, LOSS OF PROFITS, LOSS OF DATA, LOSS OF GOODWILL, OR BUSINESS INTERRUPTION, EVEN IF OHRUS HAS BEEN INFORMED OF THE POSSIBILITY OF SUCH DAMAGES.

16.2 Liability Cap

Ohrus's total maximum liability to you, for any cause and regardless of the form of action, is limited to the amount paid for the Services during the three (3) months prior to the event giving rise to the claim.

16.3 Exceptions

The above limitations do not apply to damages caused by Ohrus's wilful misconduct or gross negligence, nor to situations where liability limitation is prohibited by mandatory law.

17. Indemnification

17.1 You agree to defend, indemnify, and hold harmless Ohrus, its directors, employees, partners, and licensors from and against any claims, liabilities, damages, losses, and expenses (including reasonable legal fees) arising from or related to:

• Your use of the Platform in violation of these Terms;
• The Content of Messages you send through the Platform;
• Your violation of any third-party rights, including privacy or intellectual property rights;
• Your violation of any applicable law or regulation, including anti-spam, data protection, or telecommunications legislation in your Recipients' jurisdiction;
• Unauthorised use of Recipient data or contacts registered on the Platform.

17.2 Ohrus will promptly notify you of any claim covered by this clause and will reasonably cooperate in its defence. You may not enter into any settlement that imposes obligations on Ohrus without its prior written consent.

18. Suspension and Termination

18.1 Termination by the User

You may close your account at any time through the Platform settings or by contacting support@ziett.co. Closure will not entitle you to a refund of credits or payments made.

18.2 Suspension or Termination by Ohrus

Ohrus reserves the right to suspend or terminate, with or without prior notice, the access of any User or Billing Account in the following cases:

• Violation of these Terms or the Acceptable Use Policy;
• Fraudulent, illegal, or abusive activity;
• Non-payment of amounts owed;
• Risk to the security, integrity, or availability of the Platform;
• Order from a competent authority.

18.3 Effects of Termination

Upon termination:

• Access to the Platform is immediately revoked;
• Data is retained for the legally required period and subsequently deleted, as per the Privacy Policy;
• Provisions of these Terms that, by their nature, should survive termination will remain in force, including sections on liability, indemnification, intellectual property, and governing law.

19. Changes to the Terms

Ohrus may update these Terms at any time. Changes will be published on this page with the updated date.

Where changes are materially significant, Ohrus will notify Users and Billing Accounts via their registered email with reasonable advance notice.

Continued use of the Platform after changes take effect constitutes acceptance of those changes. If you do not agree with the changes, you must stop using the Platform and close your account.

20. Governing Law and Dispute Resolution

20.1 These Terms are governed by and interpreted in accordance with the laws of the Republic of Angola.

20.2 Without prejudice to the above, to the extent that mandatory data protection, telecommunications, or consumer protection legislation of the client's Registration Country or the Recipients' jurisdiction establishes rights or obligations that cannot be contractually waived, such legislation shall apply to the extent strictly required by law.

20.3 Any dispute arising from or related to these Terms shall be submitted, in the first instance, to a good-faith mediation process between the parties, with a minimum duration of 30 days. If no agreement is reached through mediation, the dispute shall be submitted to the competent courts of Luanda, Angola, unless otherwise expressly agreed in writing.

20.4 Clients based in the European Union, United Kingdom, or Brazil may contact Ohrus to negotiate alternative dispute resolution clauses appropriate to their jurisdiction.

21. General Provisions

21.1 Entire Agreement — These Terms, together with the Privacy Policy, Cookie Policy, Subprocessors List, and the Data Processing Addendum (where applicable), constitute the complete agreement between the parties regarding use of the Platform, superseding any prior agreements on the same subject matter.

21.2 Severability — If any provision of these Terms is found invalid, illegal, or unenforceable by a competent court, the remaining provisions will continue in full force and effect.

21.3 Waiver — Failure to exercise or enforce any right under these Terms does not constitute a waiver of that right.

21.4 Assignment — You may not assign or transfer your rights or obligations under these Terms without Ohrus's prior written consent. Ohrus may assign these Terms, in whole or in part, to any affiliate or in the context of a merger, acquisition, or asset sale, with reasonable advance notice to you.

21.5 Force Majeure — Ohrus will not be liable for delays or failures in fulfilling its obligations caused by circumstances beyond its reasonable control, including natural disasters, third-party infrastructure failures, government actions, or other force majeure events.

22. Contact

For questions related to these Terms, the Platform, or the Services:

• Website: https://ziett.co
• Support: support@ziett.co
• Privacy: privacy@ziett.co
• Legal Entity: Ohrus Labs - Service, Lda — TIN: 5002714485
• Phone: +244 955 577 430

© 2026 Ohrus Labs - Service, Lda. All rights reserved.