> For the complete documentation index, see [llms.txt](https://penida.gitbook.io/big-digital-download/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://penida.gitbook.io/big-digital-download/miscellaneous/license-key-how-can-i-be-sure-a-license-key-wont-be-used-twice.md).

# LICENSE KEY • How can I be sure a license key won't be used twice?

{% hint style="success" %}
When an order is placed, we assign 1 key to 1 order. This key won't be assigned again (unless you want so). **Just make sure you follow the guide below to properly tag and assign license keys**
{% endhint %}

{% content-ref url="/pages/2fGeAWWolt12QngPY0c0" %}
[How to configure and sell license keys?](/big-digital-download/most-asked-questions/how-to-configure-and-sell-license-keys.md)
{% endcontent-ref %}