> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.ninjatrader.com/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.ninjatrader.com/_mcp/server.

# Licensing User Authentication

## Licensing/User Authentication

NinjaTrader provides a free vendor license management service for user authentication to qualified 3rd party developers.

The service includes the following features:

* One method call within your **NinjaScript** indicator or strategy's constructor will enable the authentication process
* A **NinjaScript AddOn** dedicated to license management (Manage license, provide free trials)
* Licenses are exclusively tied to a combination of user-defined prefix + **PC machine ID** value, ensuring that licenses cannot be shared
* Manage all of your individual products, or group products together for licensing
* Licenses expire based on time/date
* Create free trial periods

For more information please contact [info@ninjatraderecosystem.com](mailto:info@ninjatraderecosystem.com) or your **NinjaTrader Business Development** representative. Once approved, you will receive a unique **Vendor ID** used to manage your user licenses, a **Vendor Licensing Help Guide** containing information, samples, and resources to guide you through the process of managing licensing.