DRM with AVPLay

I try config and play my content DRM (Widevide) with AVPlay API from https://developer.samsung.com/smarttv/develop/guides/multimedia/media-playback/using-avplay.html
I also try sample in https://github.com/SamsungDForum/PlayerAVPlayDRM. But it’s dont working. I always get error from ondrmevent event callback. Do you have an example config DRM with AVPlay API. Thanks a lot