> ## Documentation Index
> Fetch the complete documentation index at: https://signatureapi-daf4ee54.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Protect your deliverable with a password

> Protect your deliverable with password encryption.

You can protect a deliverable with password encryption by including a `password` property in your request. Recipients must enter the password to open the PDF.

The deliverable PDF is encrypted with AES-128 encryption.

```json Deliverable (Request) theme={null}
{
    "type": "standard",
    "password": "SecurePass123",
    //...
}
```

<Note>Password protection must be enabled on your account before use. [Contact support](https://signatureapi.com/support) to enable this feature.</Note>

## Password Requirements

* Between 4 and 32 characters
* Uppercase letters (A-Z), lowercase letters (a-z), and numbers (0-9) only
* Special characters are not supported due to PDF reader compatibility

<Tip>
  For strong protection, use at least 12 characters with a random mix of uppercase letters, lowercase letters, and numbers.
</Tip>

## API Response

In API responses, the password is always masked as `********`.

```json Deliverable (Response) theme={null}
{
    "type": "standard",
    "password": "********",
    //...
}
```