How to get PlayReady DRM Info from Android TV?

Question

I want to get PlayReady DRM Info from Nexus Player in Android. I have tried many methods, but they did not work. Can anyone help me? Thank you very much.

1. I looked at free application(DRM Info). It can tell me PlayReady is supported, but it cannot get vending, security level of PlayReady DRM.
2. I used MediaDrm to get DRM Info. If UUID is WideVine, it can get vending, security level of WideVine DRM. But if UUID is PlayReady, it cannot work.

private static final UUID PALYREADY_UUID = new UUID(0x9A04F07998404286L, 0xAB92E65BE0885F95L);

@TargetApi (Build.VERSION_CODES.JELLY_BEAN_MR2)
@SuppressWarnings("ResourceType") 
private void getWVDrmInfo() {
    MediaDrm mediaDrm = null;
    try {
        mediaDrm = new MediaDrm(PALYREADY_UUID);
        String vendor = mediaDrm.getPropertyString(MediaDrm.PROPERTY_VENDOR);
        mediaDrm.release(); 
     } catch (UnsupportedSchemeException e) {
         e.printStackTrace(); 
     } 
}

I used this method ,but it did not work.

Can anyone help me?