# Licensing robots for unattended automations

> To execute unattended automations, you need to allocate one or more robot licenses (or [runtimes](https://docs.uipath.com/overview/other/latest/overview/service-licensing#runtimes-(robot-licenses))) to your robots, specifically to the machine that hosts your robots. The number of runtimes assigned to a machine represents the maximum number of concurrent executions. For example, with one runtime, you can execute only one unattended automation at a time. With five runtimes, you can execute up to five unattended automations at the same time, on the same host machine.

To execute unattended automations, you need to allocate one or more robot licenses (or [runtimes](https://docs.uipath.com/overview/other/latest/overview/service-licensing#runtimes-(robot-licenses))) to your robots, specifically to the machine that hosts your robots. The number of runtimes assigned to a machine represents the maximum number of concurrent executions. For example, with one runtime, you can execute only one unattended automation at a time. With five runtimes, you can execute up to five unattended automations at the same time, on the same host machine.

The following runtimes are available for unattended automations:

* Production (Unattended)
* Testing
* App Testing

## Via Orchestrator

To license a robot for unattended automations, first upload and activate a license in Orchestrator, then connect the robot to that Orchestrator instance.

To connect a robot to Orchestrator, you need to know the client credentials (client ID and secret) generated by the machine object in Orchestrator.

* In the Assistant, use the [Client ID connection type](https://docs.uipath.com/orchestrator/automation-cloud/latest/user-guide/connecting-robots-to-orchestrator#connecting-unattended-robots-to-orchestrator-using-the-client-credentials-in-the-assistant), and provide the client credentials.
* In the Command Line Interface, use the[`--connect` command](https://docs.uipath.com/orchestrator/automation-cloud/latest/user-guide/connecting-robots-to-orchestrator#connecting-unattended-robots-to-orchestrator-using-the-client-credentials-in-the-command-line), and provide the client credentials.

## Via Command Line (using the License Tool)

To license a robot without connecting it to Orchestrator, use the License Tool `activate` command in the Command Prompt. The license activation can be done offline and online.

Check out the [LicenseTool utility](https://docs.uipath.com/robot/standalone/latest/admin-guide/according-to-license#licensetool-utility) for more commands and parameters.

### For online activation

Run the following command in the same directory where the `UiPath.LicenseTool.exe` is found, and `1234-5678-9010-1112`is the license string.

```
C:\Program Files\UiPath\Studio\UiPath.LicenseTool.exe activate -l 1234-5678-9010-1112
```

### For offline activation

Run the following command in the same directory where the `UiPath.LicenseTool.exe` is found, and `c:\Downloads\license.txt` is the path to the license file.

```
C:\Program Files\UiPath\Studio\UiPath.LicenseTool.exe activate-offline -f c:\Downloads\license.txt
```