Workflow for playing protected content

Create a MediaPlayer instance.
```
player = new MediaPlayer();
```
Register MediaPlayerCapabilityChangeEvent.HAS_DRM_CHANGE event to the player. This event will be dispatched if the content is DRM protected.
```
player.addEventListener(MediaPlayerCapabilityChangeEvent.HAS_DRM_CHANGE, onDRMCapabilityChange);
```

In the event handler, obtain the DRMTrait instance. DRMTrait is the interface through which you invoke DRM-related methods, such as authenticate(). When loading a DRM-protected content, OSMF performs the DRM validating actions and dispatches state events. Add a DRMEvent.DRM_STATE_CHANGE event handler to the DRMTrait.

private function onDRMCapabilityChange(event :MediaPlayerCapabilityChangeEvent):void
    {
        if (event.type == MediaPlayerCapabilityChangeEvent.HAS_DRM_CHANGE
            && event.enabled)
        {
            drmTrait = player.media.getTrait(MediaTraitType.DRM) as DRMTrait;
            drmTrait.addEventListener
                (DRMEvent.DRM_STATE_CHANGE,                     onDRMStateChange);
        }
    }

Handle the DRM events in the onDRMStateChange() method.

private function onDRMStateChange(event :DRMEvent) :void
{
    trace ( "DRMState: ",event.drmState);
    switch(event.drmState)
    {
        case DRMState.AUTHENTICATION_NEEDED:
            // Identity-based content
            var authPopup :AuthWindow = AuthWindow.create(_parentWin);
            authPopup.serverURL = event.serverURL;
            authPopup.addEventListener("dismiss", function () :void {
                trace ("Authentication dismissed");
                if(_drmTrait != null)
                {
                    //Ignore authentication. Just
                    //try to acquire a license.
                    _drmTrait.authenticate(null, null);
                }
            });
            authPopup.addEventListener("authenticate",
                            function (event :AuthWindowEvent) :void {
                if(_drmTrait != null)
                {
                    _drmTrait.authenticate(event.username, event.password);
                }
            });
            authPopup.show();
            break;
        case DRMState.AUTHENTICATING:
            //Display any authentication message.
            trace("Authenticating...");
            break;
        case DRMState.AUTHENTICATION_COMPLETE:
            // Start to retrieve voucher and playback.
            // You can display the voucher information at this point.
            if(event.token)
            // You just received the authentication token.
            {
                trace("Authentication success. Token: \n", event.token);
            }
            else
            // You have got the voucher.
            {
                trace("DRM License:");
                trace("Playback window period: ",
                    !isNaN(event.period) ? event.period == 0 ?
                    "<unlimited>" : event.period : "<none>");
                trace("Playback window end date: ",
                    event.endDate != null ? event.endDate : "<none>");
                trace("Playback window start date: ",
                    event.startDate != null ? event.startDate : "<none>");
            }
            break;
        case DRMState.AUTHENTICATION_ERROR:
            trace ("DRM Error:", event.mediaError.errorID +
                "[" + DRMErrorEventRef.getDRMErrorMnemonic
                (event.mediaError.errorID) + "]");
            //Stop everything.
            player.media = null;
            break;
        case DRMState.DRM_SYSTEM_UPDATING:
            Logger.log("Downloading DRM module...");
            break;
        case DRMState.UNINITIALIZED:
            break;
    }
}