Every reader gets their own private download link. These settings, in the **Delivery Protection** section of the **File Delivery** tab, control how that link can be used. Click **Save changes** after changing them.

## Confirm email first

Tick **Readers must confirm their email before they can download**. Readers must click a link in their email before the download works. This stops people signing up with someone else's address.

## How long the link works

**Link works for (days)** can be from 1 to 365 days. It counts from when the reader signs up, or from when they confirm if confirmation is on. After that, the reader sees that the link has expired and can sign up again for a new one.

## Downloads per file

**Downloads per file** can be from 1 to 50. It's per reader and per file. When a reader uses them all up, the page says they've reached the limit.

## Tell me when a link looks shared

Tick **Tell me when a link looks shared**. If one reader's link is used from two or more different networks, you get a notification in the app and an email. This is a warning only.

## Sharing prevention

**Sharing prevention** decides what happens when a link is used from many networks:

- **Never, only tell me**: the link keeps working.
- **3**, **4** or **5** different networks: the link switches off once it's used from that many networks. The default is 3.

A switched-off reader shows as "Switched off: shared" on the **Readers** tab.

Someone downloading at home, at work and on their phone may use two or three networks, so a very low limit can catch honest readers.

## Stamp each reader's copy

Tick **Stamp each reader's copy with their name** to add a visible line to each reader's copy, such as "Prepared for Sam".

- Works for PDF and EPUB files up to 50 MB.
- **What the stamp says** can be up to 160 characters and can use {{name}}, {{email}} and {{date}}. The default is "Prepared for {{name}}".
- **How visible** can be Light, Medium or Strong.

Send yourself a test to see the stamp on a real copy. Test downloads are stamped too.