# license: License Keys

Plesk comes with a limited trial license key which is installed automatically. Therefore, to fully use Plesk as you need, you should obtain a license key from Plesk or one of its resellers and install it to your Plesk.

Once you purchase a Plesk license key at the Plesk online store, you will receive an activation e-mail with your activation code and a license key file. You can install a Plesk license key either by entering the activation code or by uploading the file from this e-mail. In both cases, you should use the `license` utility. You may also use this utility for installing additional license keys that allow using Plesk additional features (add-ons) like Acronis True Image, Kaspersky Antivirus, and so on. Note that the `license` utility supports the installation of additional keys through an activation code only.

## Usage

    license <command> [<option_1> [<param>][<option_2> [<param>]]

## Example

The following command installs an additional license key:

    plesk bin license -i AB1C23-4DEF56-7GHI89-JK1L23-MNP456 -additional-key true

## Commands

Command | Parameter | Description | Example
--- | --- | --- | ---
`--install` or `-i` | `<filename>|<activation code>` | If a filename is provided, installs a license key from the specified file. If a code is provided, installs a license key that is associated with the code. | To install a license key from the file:
    plesk bin license -i key.xml
To install a license key by using the activation code:
    plesk bin license -i AB1C23-4DEF56-7GHI89-JK1L23-MNP456
`--check-installed-license` or `-c` |  | Checks the validity of the installed license key (returns the 0 exit code if the key is valid and 1 if it is invalid) | To check the validity of the installed license:
    plesk bin license -c
`--retrieve` |  | Retrieves the installed license keys. | To retrieve the installed license keys:
    plesk bin license --retrieve
`--help` or `-h` |  | Displays help on the use of the utility. | To view help on the use of this utility:
    plesk bin license -h

## Options

Option | Parameter | Description | Example
--- | --- | --- | ---
`-additional-key` | `true|false` | Specifies whether the provided activation code is for an additional license key. You can skip this option in case you are installing a Plesk’s main license key. | To install an additional license key:
    plesk bin license -i AB1C23-4DEF56-7GHI89-JK1L23-MNP456 -additional-key true