You're looking for a write-up on "License Key For Video Downloadhelper". Here's some information:

Using a license key from an unofficial source can be a security risk. It's essential to prioritize your online safety and respect the intellectual property of software developers.

The answer depends on how you obtain the extension. If you download Video DownloadHelper from the official browser store (e.g., Chrome Web Store or Mozilla Add-ons), you don't need a license key. The extension is free to use, and you can start downloading videos right away.