> ## Documentation Index > Fetch the complete documentation index at: https://docs.quarkle.ai/llms.txt > Use this file to discover all available pages before exploring further. # Safety, privacy & your data > What's private, what's never used for training, and how mature content is handled. Your manuscript is yours. This page explains exactly what that means in practice. The Quarkle Settings sheet ## Your writing is never training data Quarkle does **not** train on your writing. We also ensure our AI providers **cannot** train on your data. It's used only to answer your request in the moment, then it's done its job. We don't sell your data, and we don't want to. We'd rather earn your subscription with a better product. ## What's private, and what isn't By default, a manuscript is **private to you**. It becomes visible to others only when *you* choose to: * **Invite a collaborator.** They get read-only access. See [Sharing](/editor/sharing). * **Turn on a public reading link.** Anyone with the URL can read it, until you turn it off. Nothing you write is shared, indexed, or made public unless you take one of those steps. ## How mature content is handled Quarkle supports serious fiction, including dark and mature themes. To keep the default experience appropriate while still letting adult authors write freely, each Chat message you send is first checked by a dedicated **content-safety model** against a clear policy. * For most requests, nothing changes. Your message goes straight through. * If a request involves mature or explicit content and you're on **Basic**, Quarkle will point you toward Pro's **[Open Expression](/account/manage-your-account)** mode rather than filtering silently. * If you're a **Pro** user with **Open Expression** enabled, eligible requests are routed to an **unfiltered** model built for that content. Open Expression is opt-in and gated behind an **18+** confirmation and terms acceptance the first time you turn it on. Open Expression is a Pro feature. You enable it from your **Settings** → **Preferences**. See [Manage your account](/account/manage-your-account). ## Deleting your data You're in control of removing your data, too. * **Delete a manuscript** from its **"…"** menu in the [Studio](/getting-started/the-studio). This can't be undone. * **Delete your account** from **Settings → Danger → Delete Account** (you type `delete my account` to confirm). This **immediately and permanently** wipes your data from our servers. It cannot be recovered. See [Manage your account](/account/manage-your-account). Questions about privacy or your data? Email **[team@quarkle.ai](mailto:team@quarkle.ai)**. A real person on our team will answer. Ready to write? Start here.