# License key

To use HyperFormula, you need to specify which [license type](licensing.md#available-licenses) you use, by entering a license key in your [configuration options](configuration-options.md).

## GPLv3 license

If you use HyperFormula under [GNU General Public License v3.0](https://github.com/handsontable/hyperformula/blob/master/LICENSE.txt) (GPLv3), in your [configuration options](configuration-options.md), assign the mandatory `licenseKey` property to a string, `gpl-v3`:

```js
const options = {
  licenseKey: 'gpl-v3',
  //... other options
}
```

## Proprietary license

To use HyperFormula under a [proprietary license](licensing.md#proprietary-license), follow these steps:

1. Contact our [Sales Team](licensing.md#proprietary-license) to purchase a proprietary license.
2. Our Sales Team sends you your proprietary license key.
3. In your [configuration options](configuration-options.md), assign the mandatory `licenseKey` property to your proprietary license key:

```js
const options = {
  // replace xxxx-xxxx-xxxx-xxxx-xxxx with your proprietary license key:
  licenseKey: 'xxxx-xxxx-xxxx-xxxx-xxxx',
  //... other options
}
```

### Proprietary license key validation

> HyperFormula doesn't use an internet connection to validate your proprietary license key.

Which versions of HyperFormula a key covers, and for how long, follows from the
terms of your contract. Your key carries those terms, and HyperFormula applies
them locally, without any connection to a server.

## Feature packages and add-ons

A proprietary license key may grant the whole library, or only part of it.

If your key grants only part of the library, then:

* A function your key doesn't include evaluates to a `#LIC!` error, in the same way as any other
  [error value](types-of-errors.md). Everything else in the sheet keeps calculating.
* An API method your key doesn't include throws a `LicenseCapabilityMissingError` when you call
  it. Getters never throw; `copy()` and `cut()` do, because they belong to the clipboard feature.
* [`getAvailableFunctions()`](../api/classes/hyperformula.md#getavailablefunctions) and
  [`getFunctionDetails()`](../api/classes/hyperformula.md#getfunctiondetails) describe only the
  functions your key includes, so a function picker built from them never offers a function that
  then fails.

## License key notifications

If your license key is missing, invalid, or expired, you see a
corresponding notification in the console.

A missing or invalid key makes every licence-gated function call evaluate to a `#LIC!` error — but
no API method starts throwing, and `getAvailableFunctions()` still describes the full set of
functions. A key problem never narrows what the library reports it can do.

Depending on your license terms, an expired key either behaves the same way, or keeps working with
what it grants and prints an error in the console.

## License key support

If you have any issues with your license key, [contact our team](contact.md).