Unity

using System.Collections;
using UnityEngine;
using Viveport;

public class ViveportSampleDRM : MonoBehaviour
{
    // Get a VIVEPORT ID and VIVEPORT Key from the VIVEPORT Developer Console. Please refer to here:
    // https://developer.viveport.com/documents/sdk/en/viveport_sdk/definition/get_viveportid.html

    static string VIVEPORT_ID = "VIVEPORT ID of the content";           // replace with developer VIVEPORT ID
    static string VIVEPORT_KEY = "VIVEPORT Key of the content";         // replace with developer VIVEPORT Key

    private const int SUCCESS = 0;
    private static bool bInitComplete = false;

    void Awake()
    {
        MainThreadDispatcher mainThreadDispatcher = GameObject.FindObjectOfType<MainThreadDispatcher>();
        if (!mainThreadDispatcher)
        {
            gameObject.AddComponent<MainThreadDispatcher>();
        }
    }

    void Start()
    {
        Api.Init(InitStatusHandler, VIVEPORT_ID);       // initialize VIVEPORT platform
        Invoke("CheckInitStatus", 10);                  // check that VIVEPORT Init succeeded
    }

    void OnDestroy()
    {
        Api.Shutdown(ShutdownHandler);
    }

    private static void InitStatusHandler(int nResult)          // The callback of Api.init()
    {
        if (nResult == SUCCESS)
        {
            Debug.Log("VIVEPORT init pass");
            Api.GetLicense(new MyLicenseChecker(), VIVEPORT_ID, VIVEPORT_KEY);    // the response of Api.Init() is success, continue using Api.GetLicense() API
            bInitComplete = true;
        }
        else
        {
            Debug.Log("VIVEPORT init fail");
            Application.Quit();
            return;                                             // the response of Api.Init() is fail
        }
    }
    private static void ShutdownHandler(int nResult)            // The callback of Api.Shutdown()
    {
        if (nResult == SUCCESS)
        {
            Application.Quit();                                 // the response of Api.Shutdown() is success, close the content
        }
        else
        {
            return;                                             // the response of Api.Shutdown() is fail
        }
    }

    private void CheckInitStatus()
    {
        if (!bInitComplete)
        {
            Debug.LogWarning("Viveport init check fail");     // init requires VIVEPORT app installed and online connection
            Application.Quit();
        }
        else
            Debug.Log("Viveport init check pass");
    }

    class MyLicenseChecker : Api.LicenseChecker
    {
        public override void OnSuccess(long issueTime, long expirationTime, int latestVersion, bool updateRequired)
        {
            // the response of Api.GetLicense() is DRM success, user is allowed to use the content and continue with content flow
            Debug.Log("Viveport DRM pass");
            Debug.Log("issueTime: " + issueTime);
            Debug.Log("expirationTime: " + expirationTime);
            MainThreadDispatcher.Instance().Enqueue(SuccessAction());
        }

        public override void OnFailure(int errorCode, string errorMessage)
        {
            // the response of Api.GetLicense() is DRM fail, user is not allowed to use the content
            Debug.LogWarning("Viveport DRM fail:"+ errorCode + " Message :" + errorMessage);
            MainThreadDispatcher.Instance().Enqueue(FailAction());
        }

        // Use these methods to call Unity functions from the API callbacks on the main thread
        IEnumerator SuccessAction()
        {
            yield return null;
        }

        IEnumerator FailAction()
        {
            Application.Quit();
            yield return null;
        }
    }
}