> ## Documentation Index
> Fetch the complete documentation index at: https://devdocs.xbox.com/llms.txt
> Use this file to discover all available pages before exploring further.

# How to set read-only player data

> Write read-only PlayFab player data from server APIs so clients can read authoritative progression values without being able to modify them.

To set read-only KVPs, you must call the Server API [UpdateUserReadOnlyData](xref:titleid.playfabapi.com.server.playerdatamanagement.updateuserreadonlydata) method from a server process. This is data that the server can modify, but the client can only read.

The C# Samples in this topic are written for the Unity SDK. The Unity SDK uses an event driven model to handle non-synchronous tasks. To run the sample code using the C# SDK you must modify the code to use an async Task model. Methods that must be modified have Async append to the method name in the signature. For example, SetObject in the Unity SDK becomes SetObjectAsync in the C# SDK. For more information, see [Asynchronous programming with async and await](https://learn.microsoft.com/en-us/dotnet/csharp/programming-guide/concepts/async/).

## C# code example

The following **C#** code example uses the PlayFab server API to create (or update, if the KVPs already exist) the KVPs with the key named `Father`, with the value `Fred`,  `Mother` with the value `Alice`, `Sister` with the value `Lucy`, and `Brother` with the value `Doug`.

```csharp theme={null}
public void UpdateUserReadOnlyData() {
    PlayFabServerAPI.UpdateUserReadOnlyData(new UpdateUserDataRequest() {
        PlayFabId = "user PlayFabId here - obtained from any successful LoginResult",
        Data = new Dictionary<string, string>() {
            {"Father", "Fred"},
            {"Mother", "Alice"},
            {"Sister", "Lucy"},
            {"Brother", "Doug"}
        },
        Permission = UserDataPermission.Public
    },
    result => Debug.Log("Set read-only user data successful"),
    error => {
        Debug.Log("Got error updating read-only user data:");
        Debug.Log(error.GenerateErrorReport());
    });
}
```

## See also

[How to get read-only player data](/services/playfab/player-progression/player-data/how-to-get-read-only-player-data)


## Related topics

- [How to get read-only player data](/services/playfab/player-progression/player-data/how-to-get-read-only-player-data.md)
- [Quickstart Player Data](/services/playfab/player-progression/player-data/quickstart.md)
- [PFPlayerDataManagementServerGetUserReadOnlyDataAsync](/services/playfab/api-references/c/pfplayerdatamanagement/functions/pfplayerdatamanagementservergetuserreadonlydataasync.md)
- [PFPlayerDataManagementClientGetUserReadOnlyDataAsync](/services/playfab/api-references/c/pfplayerdatamanagement/functions/pfplayerdatamanagementclientgetuserreadonlydataasync.md)
- [PFPlayerDataManagementClientGetUserPublisherReadOnlyDataAsync](/services/playfab/api-references/c/pfplayerdatamanagement/functions/pfplayerdatamanagementclientgetuserpublisherreadonlydataasync.md)