# ValidateProductKeyDelegate delegate

Namespace: [Rhino.PlugIns](https://developer.rhino3d.com/api/rhinocommon/namespace/rhino.plugins.md) · Assembly: [RhinoCommon](https://developer.rhino3d.com/api/rhinocommon/assembly/rhinocommon.md)

```cs
public delegate ValidateProductKeyDelegate
```

Validates a product key or license.

**Signature:**

```cs
ValidateResult ValidateProductKeyDelegate(string productKey, out LicenseData licenseData)
```

**Parameters:**

- `productKey` ([string](https://learn.microsoft.com/dotnet/api/system.string))
- `licenseData` (out [LicenseData](https://developer.rhino3d.com/api/rhinocommon/type/rhino.plugins.licensedata.md))