Estravon — Terms of Service

1. About these terms

These Terms of Service ("Terms") are a contract between you and Tiberavon Ltd, a company registered in England and Wales (No. 17234096, registered office Henleaze House Business Centre, Bristol), trading as Estravon ("we", "us", "our"). They govern your use of the Estravon hosted service: account registration, payment, and the cloud extraction service at api.estravon.com used by the Estravon Zotero plugin.

By registering, subscribing, or buying credits you accept these Terms. We record which version you accepted and when.

These Terms do not govern the open-source vanilla backend or the Zotero plugin, which are licensed separately under AGPL-3.0 (see Section 17).

2. The service

Estravon converts pages of PDF documents in your Zotero library into Markdown, returned as an attachment on the relevant item. Conversion is performed for us by third-party extraction providers. The current providers, their roles, and where they process your files are listed in our Privacy Notice (estravon.com/privacy) and may change as we add or substitute providers; material changes to where your data is processed will be notified as set out in Section 16.

We may improve, change, or withdraw features. We will give reasonable notice of material changes that disadvantage you.

3. Eligibility, your account and your key

You must be at least 18 and able to form a binding contract. You must provide a valid email address and keep any access key or credential secret. You are responsible for all activity under your account or key. Tell us promptly at support@estravon.com if you believe your credential has been compromised.

Your access is to the Estravon service. We do not give you, and you must not seek, the API keys or accounts of our underlying extraction providers; you must not buy, sell, share, or transfer any access key or account to or with a third party.

4. Plans, prices and payment

We may offer the service as one-time credit packs (measured in pages) and/or as a recurring subscription with a monthly page allowance. Current plans and prices are shown at estravon.com/pricing .

• Credit packs are consumed as you run extractions and are subject to Section 6.
• Subscription allowances reset each billing period and do not roll over to the next period unless we expressly state otherwise.

Payment is processed by Stripe; the statement descriptor is ESTRAVON. Prices include or exclude VAT as stated at checkout. Amounts already paid are non-refundable except as required by law or as expressly stated in Section 5.

5. Consumer cancellation and refunds

If you are a consumer in the UK/EU, the Consumer Contracts Regulations 2013 normally give you 14 days to cancel a purchase of digital services. Because the service can be used immediately, at checkout you will be asked to consent to the service beginning right away and to acknowledge that, once you have started using a credit pack or subscription period, you lose the right to cancel the portion you have used. You may still request a refund of the unused portion within the 14-day window, refunded to your original payment method.

Nothing in these Terms removes your non-excludable statutory rights.

6. Maintenance fee (credit packs only)

Plain-English summary (key term — please read): credits you buy and leave unused are reduced by a small maintenance fee over time. This is not a charge to your card — it is a deduction from your unused credit balance. It does not apply to subscription allowances.

The maintenance fee, where it applies:

• applies only to unused credits, deducted on a recurring cycle ( 1 month );
• does not apply to promotional packs (e.g. the Founding 20 pack) or to subscription plans;
• is preceded by a reminder 7 days before each deduction, with your live balance always visible in your account; and
• closes a pack automatically when its balance reaches zero.

You consent to this term explicitly at checkout.

7. Your content, your rights, and copyright

You retain all rights in the documents you upload ("Your Content") and you own the Markdown output we generate from them. We claim no ownership of either. You grant us only the limited, temporary licence needed to process Your Content in order to produce your output and provide the service.

We process Your Content only to produce your Markdown and delete it promptly — the source PDF immediately after the job, and the result within approximately one hour (see the Privacy Notice).

You represent and warrant that, for each document you submit, you have the right to copy and convert it — for example because you own the copyright, hold a licence, or your use is permitted by an applicable copyright exception (such as fair dealing for non-commercial research or private study under UK law). You must not use Estravon to reproduce, or to make copies of, any work you do not have the right to copy. You, not Tiberavon Ltd, are responsible for the lawfulness of your use of both the input and the output.

8. Copyright complaints

We respect intellectual-property rights and expect our users to do the same. Although we do not host or retain Your Content (we delete it promptly per Section 7), if you believe the service is being used to infringe your copyright, contact us at legal@tiberavon.com with: your contact details; identification of the work; the basis for your belief; and a statement that your complaint is made in good faith. We will review credible complaints promptly and may suspend or terminate the account(s) of users who use the service to infringe, including repeat infringers.

9. Acceptable use

You must not, and must not allow anyone using your account to:

• use the service in breach of any applicable law, or to infringe, misappropriate, or violate anyone's rights (including intellectual-property or privacy rights);
• upload malicious files, or attempt to overload, probe, reverse-engineer, circumvent, or bypass the service, its rate limits, its billing, or any security or moderation mechanism of the service or of our underlying providers;
• attempt to discover, reverse-engineer, or extract the models or underlying components of our extraction providers, or use the output to do so;
• use the output to build or train a product or model that competes with the service or with our providers' models;
• resell, sublicense, or provide third parties with access to the hosted service except as we expressly permit; or
• submit content that is unlawful, or that the underlying providers' usage rules prohibit (for example child sexual abuse material, content that promotes violence or hatred, or content created to defraud or deceive).

[NOTE: several of these (no reverse-engineering, no competing-model training, no key transfer, no prohibited content) are flow-down obligations our providers require us to impose on our users; this section discharges that requirement. We may suspend or terminate accounts that breach it.]

10. Third-party providers, data protection and international transfers

To deliver the service we rely on third-party processors, including our extraction provider(s), our payment processor (Stripe), and our email provider (Resend). We act as the data controller for your personal data and these providers act as our processors (or, for their own purposes, as independent controllers). The current list of providers and the country in which each processes data is maintained in our Privacy Notice.

Some providers process data in the United States; others (such as our primary EU extraction provider) process within the European Union. Where personal data is transferred outside the UK, we rely on an appropriate safeguard (such as the UK International Data Transfer Agreement, or the EU Standard Contractual Clauses with the UK Addendum). Our handling of personal data is described in the Privacy Notice.

11. No training on Your Content

We do not use Your Content or your output to train artificial-intelligence models, and we configure our extraction providers so that they do not do so either (for example by using paid processing tiers, training opt-outs, and zero-data-retention settings where available). Limited exceptions our providers may apply — such as transient automated moderation — are described in the Privacy Notice.

12. Availability and accuracy

The service is provided on a reasonable-efforts basis. Extraction quality depends on the source PDF and the underlying models; we do not guarantee that the Markdown output is complete or error-free, and you should review output before relying on it. We do not guarantee uninterrupted availability and may take the service down for maintenance, or be affected by an outage or suspension at an underlying provider.

13. Our liability

Nothing in these Terms limits liability that cannot be limited by law (including for death or personal injury caused by negligence, or for fraud). Subject to that:

• we are not liable for indirect or consequential loss, loss of data you failed to keep your own copy of, or loss of profits or opportunity;
• our total liability to you for any claim is limited to the amount you paid us in the 3 months before the event giving rise to the claim.

If you are a consumer, your statutory rights are unaffected by this section.

14. Indemnity

If you use the service in the course of a business, you agree to indemnify Tiberavon Ltd against claims, losses, and costs arising from your unlawful use of the service or your breach of Sections 7, 8, or 9.

15. Suspension and termination

You may stop using the service at any time. We may suspend or end your access for breach of these Terms, suspected fraud, non-payment, where required by law, or if an underlying provider suspends or withdraws a capability we depend on. On termination, unused non-promotional credits may be refundable at our discretion subject to Section 5; subscription access ends at the end of the paid period.

16. Changes to these terms

We may update these Terms. We will post the new version with a new version string and date, and notify registered users of material changes (including material changes to where your data is processed) by email. Continued use after changes take effect means you accept them.

17. Open-source components

The Estravon Zotero plugin and the vanilla backend are open source under the AGPL-3.0 licence and are governed by that licence, not these Terms. If you self-host the vanilla backend with your own provider API key, your relationship is with that provider under its terms, not with us. These Terms apply only to the paid hosted service.

18. Governing law and disputes

These Terms are governed by the laws of England and Wales, and disputes are subject to the courts of England and Wales. If you are a consumer resident elsewhere in the UK or the EU, you keep the benefit of any mandatory consumer-protection rules of your home country.

19. Contact

Tiberavon Ltd, trading as Estravon — Henleaze House Business Centre, Bristol, UK. General: support@estravon.com · Privacy: privacy@estravon.com · Copyright/legal: legal@tiberavon.com · Company: admin@tiberavon.com