Acceptable use

Last updated 26 September 2026.

Who it applies to

The business that holds the account, the people it invites, and anything acting with its keys — an API key, an integration, a connected booking system, a counter tablet. What they send, the business sent. Someone who signs a document is not bound by this page; they are the person it protects.

Unlawful documents

• Anything unlawful where it is sent or where it is received, or a document that is part of something unlawful: a fraud, a scam, a forged agreement, an attempt to evade a sanction.
• Content you do not have the right to distribute, including somebody else's name, logo or letterhead on your branding.
• Content that sexually exploits children, or threatens or incites violence against anyone.

Deceiving the person signing

The whole value of a signature here is that it shows a named person agreed to a text they saw. So, not through us:

• A document designed to mislead the signer about what they are signing — a waiver presented as a receipt, terms buried where the page says there are none, a price that is not the price.
• Pretending to be a business, a person or an authority you are not, or sending a document in another business's name.
• Recording a signature, a consent or an answer the person did not make: signing for somebody at a counter without them, pre-filling an answer and presenting it as theirs, or ticking a text-message consent on their behalf.
• Using a document or a form to collect passwords, sign-in codes, bank credentials or card numbers. Card numbers are not to be sent through SignSealer at all, and neither are health records you handle under a business associate agreement we have not signed with you.

Harassment

• Sending documents or messages to threaten, harass, stalk, intimidate or demean anyone.
• Sending again and again to somebody who has declined, voided or asked you to stop. A declined document is an answer.

Texts and emails

Everything we carry is about a document you asked us to send: the link, one reminder, the signed copy, a code. The text messages page sets out exactly what a text may say and how consent is taken, and its rules are part of this one.

• No marketing or promotional messages, by text or by email, however they are worded. The engine refuses to record consent for a marketing purpose, and this is the same rule in words.
• Text only people who agreed to be texted, with a disclosure that meets the wording on the text messages page, and record that consent truthfully: the number, the purpose, where you took it and the words the person saw. A disclosure missing what that page requires is refused when you try to record it.
• No bought, rented, shared or scraped lists, and nobody who has no dealings with you.
• Do not work around an opt-out. A STOP suppresses the number and revokes every consent recorded against it, and a bounced or complained-about email address is not sent to again; we do that for you, and trying to put somebody back — a new record, a second number, another account — is a breach of this page.
• Nothing in a text or an email that the mobile carriers or the email providers forbid on business messaging, whatever the document is about. Their rules are stricter than ours, and one business's messages can get our toll-free number stopped for every business that uses it.

Attacking the service

• Malware, or anything intended to break the service, slow it for others, or reach another customer's data.
• Getting round a limit — a rate limit, a meter, a plan's allowance, the test sandbox's refusal to send — or using somebody else's credentials or signing link.
• Load tests or security scans against our servers without asking us first. If you think you have found a vulnerability, report it to security@signsealer.com rather than testing it further.
• Publishing an API key or a signing link. A key sends documents in your name; tell us at security@signsealer.com if one has got out and we will help you revoke it.

One account, one business

• An account is one business. Locations under common ownership, managed as one organisation, can share one.
• Carrying other, independent businesses — reselling SignSealer, or building it into a product you sell to your own customers so that they send through your account — needs a partner agreement with us. The white label add-on puts your name on the signing page; it does not make you a reseller.
• Opening several accounts to multiply the free allowance, or one account shared between unrelated businesses to share it.

If that describes what you want to do, the partner programme is the way to do it.

How we find out

We do not read your documents to check them, and nothing here changes that. We find out when somebody tells us: a signer, a recipient, a carrier, an email provider, a regulator, or you. The product also notices some things by itself — a STOP, a bounce, a complaint — and acts on them for you, as described above. Where it measures a pattern, such as one account that looks like many businesses, it produces a list for a person to read and decides nothing on its own.

What we do

What fits what happened, starting with the least:

• Ask you to fix it. Most problems are a template or a consent record that needs changing, and we would rather say so than act.
• Stop sending texts for you while a carrier or a regulator looks into messages sent from your account, as the terms say.
• Suspend the account while we find out what happened. Every change we make to an account's status needs a reason and is written to our own trail.
• End the agreement. At once, as the terms allow, for anything in their list — unlawful content, documents designed to deceive, content you have no right to send, malware or an attempt to break the service or reach another customer's data, card numbers or health records — or for not paying. For anything else on this page, on the 30 days' notice the terms give either of us.

Unless the law stops us, we tell you what we found and what we did, at the address on your account. Whatever happens, the terms' two promises hold: you can export your records first, and a certificate anyone was given stays checkable at signsealer.com/verify.

Reporting a document or a text

If you received something through SignSealer that you think breaks this page — a document pretending to be from somebody it is not, a text you never agreed to, a form asking for a password — tell us at legal@signsealer.com. Say who it claimed to be from, when it arrived, and the address or number it came to, and forward the email or copy the text as you received it. You do not need to open the link again, and please do not sign anything to show us.

For a text, you can also reply STOP and nothing more will come to that number. Our own reply to HELP says how to reach us. A security problem with SignSealer itself goes to security@signsealer.com.

Changes

This page carries the date it last changed. The terms say how a change to them reaches you, and nothing on this page can change the terms.