1. Summary

QubitHub is a public platform for hosting and collaborating on quantum circuits, datasets, and related research artifacts. These Terms set out what you can expect from us and what we ask of you in return.

The short version: you keep the copyright in everything you upload; you grant us only the minimal license we need to run the service; sublicensing to other QubitHub users is governed by the LICENSE file in your repository (not by these Terms). You agree not to abuse the platform per our Acceptable Use Policy. The Service is provided as-is during this early stage. Disputes are governed by German law.

Stage-honest disclosure. QubitHub is operated by Nandan Joshi as an unincorporated solo project. Quantputation GmbH is not yet registered. These Terms reflect that operator stage. Liability limits and SLAs are stage-appropriate — we do not promise enterprise-grade availability we cannot deliver.

2. Acceptance of these Terms

By accessing or using the Service in any way — creating an account, viewing public content, calling the API, using the CLI, or otherwise interacting with QubitHub — you agree to be bound by these Terms and by the documents they incorporate by reference, including our Privacy Policy, our Cookie Policy, our Acceptable Use Policy, and our Impressum.

If you do not agree, you must not use the Service. If you use the Service on behalf of an organization, you represent that you are authorized to bind that organization to these Terms.

3. The QubitHub service

The Service is developer infrastructure for quantum computing — a platform where you can host, share, version, fork, transfer, and execute quantum circuits and related artifacts. The exact features available evolve over time; we may add, change, or remove features at our discretion. We will provide reasonable notice for material changes affecting paid plans (see Section 11).

The Service operates in an early-stage capacity. While we apply standard care to availability, durability, and security, we make no uptime promises beyond what is stated in Section 10.

4. Your account

4.1 Eligibility

You must be at least 16 years old to create a QubitHub account. By creating an account, you represent that you meet this minimum age.

4.2 Accuracy of your information

You agree to provide accurate, current information when you create an account, and to keep it current. We rely on your email address as the primary channel for service-critical communications; if it stops working, we cannot warn you about issues with your account.

4.3 Security of your account

You are responsible for keeping your password and any API tokens confidential. You are responsible for all activity that occurs under your account. Notify us immediately at security@qubithub.co if you believe your account or any credentials have been compromised.

4.4 One person per account

Accounts are personal to you. You may not share your account credentials with others, and you may not transfer your account to another person. Organizations have a separate concept (you can be a member of one or more organizations); please use that surface rather than account sharing.

4.5 Beta-stage caveats

During the early-stage period, certain features may be marked as "beta", "experimental", or otherwise non-final. These features may change, break, or be removed without notice. Your feedback during this period is welcome and helpful, but the features are provided without commitment.

5. Your content; our license from you

You retain all rights, including any copyright, in any content you upload, post, or otherwise submit to QubitHub ("Your Content"). QubitHub does not claim ownership of Your Content.

5.1 License you grant to QubitHub

By uploading Your Content to QubitHub, you grant QubitHub a worldwide, non-exclusive, royalty-free, sublicensable (only to the extent necessary for QubitHub to operate its services) license to:

store, host, and back up Your Content;
display Your Content to other QubitHub users and visitors as you have configured visibility;
index Your Content for search and discovery;
transmit Your Content via the QubitHub API and CLI to authorized requests;
cache, format-convert, and otherwise process Your Content as necessary to provide QubitHub features (rendering, execution sandboxing, syntax highlighting, and similar); and
sublicense Your Content to other QubitHub users only as enabled by the LICENSE you select for your repository (see Section 5.2).

This license terminates when Your Content is deleted from QubitHub, subject to a backup-purge period not exceeding ninety (90) days. (See Privacy Policy Section 8 for details.)

5.2 Sublicensing to other QubitHub users — your LICENSE file controls

Whether other QubitHub users (or anyone else) may fork, modify, redistribute, or otherwise use Your Content is governed solely by the LICENSE file in your repository, not by these Terms. If your repository contains no LICENSE file, the default is "All Rights Reserved" — Your Content is publicly viewable (if you have set the repository to public visibility) but not legally forkable or reusable. This mirrors the long-established convention on platforms such as GitHub.

5.3 Your representations and warranties about Your Content

You represent and warrant that:

you own or have the necessary rights to upload Your Content and to grant the license in Section 5.1;
Your Content does not infringe any third party's intellectual property, privacy, publicity, or other rights;
Your Content complies with our Acceptable Use Policy and with all applicable laws.

5.4 Feedback

If you send us feedback, suggestions, or ideas about the Service, we may use them without restriction or obligation to you. You are not required to send us feedback, but we appreciate it when you do.

6. Acceptable use

Your use of the Service is subject to our Acceptable Use Policy (the "AUP"), which is incorporated into these Terms by reference. The AUP describes the kinds of content and behavior that are prohibited on QubitHub, the steps we take to investigate violations, and how you can report abuse.

A violation of the AUP is a violation of these Terms. We may suspend or terminate your access (see Section 12) for AUP violations.

7. QubitHub intellectual property

The QubitHub platform itself — including the website, the API, the CLI, the brand, the "QubitHub" word mark and logo, the documentation, and the underlying software code that we author — is our intellectual property and is protected by copyright, trademark, and other laws. Nothing in these Terms transfers any QubitHub intellectual property to you.

Where we publish parts of the QubitHub stack as open source under a separate license, that license governs your use of those open-source components and supersedes this Section to that extent.

You may make fair use of the QubitHub name and logo to refer to the Service in articles, talks, and similar (e.g., "I host my circuits on QubitHub"). You may not use them in a way that suggests endorsement, partnership, or affiliation we have not granted.

8. Third-party services and content

The Service integrates with or links to third-party services (including quantum hardware providers, payment processors, and analytics providers). Your use of those services is governed by their own terms and privacy policies, not by ours. We are not responsible for third-party services beyond our control.

Content uploaded by other QubitHub users (which you may discover, fork, or otherwise interact with) is the responsibility of the user who uploaded it. Your right to use that content is governed by the LICENSE file in their repository (see Section 5.2). If you believe content on QubitHub infringes your rights, use the takedown process in Section 9.

9. Notice-and-takedown

We respond to clear, complete notices of alleged infringement and to reports of other content that violates these Terms or the AUP. To submit a notice, email abuse@qubithub.co with:

your name, postal address, and a working email address;
a description of the right you claim and a link to the work or other material protected by that right (if applicable);
the URL(s) on QubitHub of the content you believe is infringing or in violation;
a statement that you have a good-faith belief that the use of the content is not authorized by the rightsholder, its agent, or the law;
a statement, made under penalty of perjury, that the information in your notice is accurate and that you are authorized to act on behalf of the rightsholder;
your physical or electronic signature.

We will acknowledge receipt within fourteen (14) days and take action (which may include removing or disabling access to the content, notifying the uploader, or rejecting the notice if it is clearly defective) within a reasonable time given the complexity of the report.

Counter-notice. If we have removed your content in response to a notice and you believe the removal was a mistake or that you have the right to post the content, you may submit a counter-notice by replying to our removal email with a written statement explaining why.

Repeat infringers. We may, in appropriate circumstances and at our discretion, terminate the accounts of users who repeatedly infringe the rights of others.

10. Service availability

We provide the Service on an "as available" basis. We do not guarantee uninterrupted access; the Service may be temporarily unavailable for maintenance, upgrades, security responses, or due to events beyond our reasonable control.

We do not commit to a specific service-level agreement (SLA) during this early-stage period. We aim for high availability and best-effort response to incidents; paid plans, when offered, may include specific operational commitments — those will be stated in the plan description at the time you subscribe.

We back up data on a routine schedule for our own operational recovery. Backups are not a substitute for your own data-retention practices; we recommend you maintain independent copies of any content that matters to you.

11. Paid plans and billing

Some features of the Service may be available only on paid plans. Pricing, billing cadence, and plan-specific terms are described at the time you subscribe. Payments are processed by Stripe; the data you provide to Stripe is subject to Stripe's terms and privacy policy.

Unless otherwise stated when you subscribe:

fees are charged in advance for each billing period and are non-refundable, except where required by applicable law;
your subscription renews automatically until you cancel; you can cancel from your account settings or by emailing billing@qubithub.co;
we may change prices on prospective billing periods with at least thirty (30) days' notice; your continued use after the change is your acceptance of the new price.

EU consumer right of withdrawal. If you subscribe as a consumer based in the EU, you have a statutory fourteen (14)-day right of withdrawal. Please note that, where you begin using a paid feature immediately and expressly request that we begin performing the service before the withdrawal period ends, you may waive that right under §356(4) BGB. We will make this consent step explicit at checkout.

12. Suspension and termination

12.1 Termination by you

You may stop using the Service at any time. To delete your account and your content, follow the instructions in the Privacy Policy Section 10. Outstanding fees for paid subscriptions remain due through the end of the current billing period; we do not provide refunds for partial periods unless required by law.

12.2 Suspension or termination by us

We may suspend, restrict, or terminate your access (in whole or in part) if:

you violate these Terms or the AUP;
we are required to do so by applicable law or by a court or competent authority;
your account poses a security or abuse risk to the Service or to other users;
your account remains inactive for an extended period and we give you reasonable notice before closing it.

12.3 Effect of termination

On termination, your right to use the Service ends. Sections of these Terms that by their nature should survive — including Sections 5 (Your Content), 7 (QubitHub IP), 13 (Disclaimers), 14 (Liability), 15 (Indemnity), and 16 (Governing Law) — will survive.

13. Disclaimers

To the maximum extent permitted by applicable law, the Service is provided "as is" and "as available" without warranties of any kind, whether express, implied, or statutory, including without limitation any implied warranties of merchantability, fitness for a particular purpose, non-infringement, or that the Service will be uninterrupted, secure, or error-free.

Quantum circuits executed through QubitHub run on the simulator and/or hardware backends you select. We do not warrant the accuracy, fidelity, or scientific validity of results returned by any backend. Use the Service for research, education, and development purposes with appropriate independent verification.

Where mandatory consumer-protection law applies (including the statutory warranties under §§434 ff. BGB for consumers in Germany), the disclaimers in this Section do not affect your statutory rights.

14. Limitation of liability

To the maximum extent permitted by applicable law, our total aggregate liability to you for any claim arising out of or in connection with these Terms or the Service is limited to the greater of (a) one hundred euro (€100) or (b) the amount you actually paid us for the Service in the twelve (12) months immediately preceding the event giving rise to the claim.

We are not liable for indirect, incidental, special, consequential, or exemplary damages, or for loss of profits, data, business, or goodwill, even if we have been advised of the possibility of such damages.

What this Section does not exclude. Nothing in these Terms excludes or limits our liability for: (i) death or personal injury caused by our negligence; (ii) intentional misconduct or gross negligence; (iii) statutory liability under the German Product Liability Act (Produkthaftungsgesetz); or (iv) any other liability that cannot be excluded or limited by applicable law.

15. Your warranties and indemnity

You agree to defend, indemnify, and hold harmless QubitHub and its operator (the natural person identified in Section 19 of these Terms, or — once registered — Quantputation GmbH) from and against any claims, liabilities, damages, losses, and expenses (including reasonable legal fees) arising out of or in connection with:

your use of the Service in breach of these Terms or applicable law;
Your Content, including any claim that Your Content infringes a third party's rights;
your breach of the representations and warranties in Section 5.3;
any dispute between you and another QubitHub user.

We will notify you in writing of any such claim and reasonably cooperate in the defense. You may not settle a claim that admits liability or imposes obligations on us without our prior written consent.

Asymmetry. The Service is provided at this stage without a reciprocal indemnity from us to you. Where mandatory consumer-protection law requires otherwise, that mandatory law prevails over this Section.

16. Governing law and venue

These Terms and any dispute arising out of or in connection with them or with the Service are governed by the laws of the Federal Republic of Germany, without regard to its conflict-of-laws rules. The United Nations Convention on Contracts for the International Sale of Goods (CISG) does not apply.

The exclusive place of jurisdiction for all disputes arising out of or in connection with these Terms is the competent court at the seat of the operator (as stated in our Impressum). For consumers, the courts at your place of residence are also available where mandatory consumer-protection law so provides.

EU online dispute resolution. The European Commission provides an online dispute-resolution platform at ec.europa.eu/consumers/odr. We are not obliged to participate in dispute-resolution proceedings before a consumer-arbitration board and do not currently do so.

17. General

17.1 Entire agreement

These Terms (together with the documents they incorporate by reference) are the entire agreement between you and us about the Service, and supersede any prior agreements between us on the same subject.

17.2 Severability

If a provision of these Terms is found unenforceable, the remaining provisions remain in full effect. The unenforceable provision will be replaced by an enforceable provision that comes as close as possible to the intent of the original.

17.3 No waiver

Our failure to enforce any provision is not a waiver of our right to enforce it later.

17.4 Assignment

You may not assign these Terms or any rights under them without our prior written consent. We may assign these Terms in connection with a merger, acquisition, asset sale, financing, or similar transaction, or to a successor operator (including assignment to Quantputation GmbH once it is registered).

17.5 No third-party beneficiaries

These Terms do not create rights enforceable by any third party.

17.6 Force majeure

We are not responsible for delays or failures caused by events beyond our reasonable control, including natural disasters, war, terrorism, riots, embargoes, acts of civil or military authorities, fire, floods, accidents, network failures, or strikes.

18. Changes to these Terms

We may update these Terms from time to time. The "Last updated" date at the top of this page indicates when the Terms were last revised. We will announce material changes through an in-app notice or by email to your account address before they take effect. Your continued use of the Service after the change date is your acceptance of the updated Terms; if you do not agree, you must stop using the Service.

Earlier versions of these Terms are available on request.

19. Contact

Operator: Nandan Joshi, operating as QubitHub (an unincorporated solo project; full Impressum data at /impressum)
Postal address: [IMPRESSUM_POSTAL_ADDRESS]
General inquiries: hi@qubithub.co
Legal notices: legal@qubithub.co
Abuse / takedown: abuse@qubithub.co
Security: security@qubithub.co
Privacy: privacy@qubithub.co