> For the complete documentation index, see [llms.txt](https://docs.recognito.vision/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.recognito.vision/face-recognition-sdk/integration-guide/windows/licensing.md).

# Licensing

{% hint style="info" %}
Click [Here ](/license-option.md)to get details about RECOGNITO license option

[License Option](/license-option.md)
{% endhint %}

## Get your HWID (Hardware ID)

To activate SDK, you have to first get your Hardware ID by using the [init\_sdk](/face-recognition-sdk/integration-guide/windows/api-reference.md#init_sdk) function.

<figure><img src="https://3902005046-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FxiEW2bRNeDz3JZIL41gD%2Fuploads%2FSMaZPs3icHyl1Rseb7Uv%2FHWID.png?alt=media&amp;token=8b5abfb1-dfbd-414b-9214-ec0b9a1ccf0a" alt=""><figcaption></figcaption></figure>

## Request License

After getting HWID, share it with us for license key.

[**Contact us**](/contact-and-support.md)

## Activate SDK

[Initializes](/face-recognition-sdk/integration-guide/windows/api-reference.md#init_sdk) the SDK after copying license key file into `engine` directory. Should be called before using of any other functions.

<figure><img src="https://3902005046-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FxiEW2bRNeDz3JZIL41gD%2Fuploads%2Foqk0fa3FBeqcZDxmlvuD%2Flicense.png?alt=media&amp;token=26468137-97a0-4511-a7d0-696a71eb253c" alt=""><figcaption></figcaption></figure>