Adobe Primetime DRM client 3.0 or later sends a Get Server Version request to determine the capabilities of the server. All servers using Primetime DRM SDK 3.0 or later must implement support for Get Server Version requests.
com.adobe.flashaccess.sdk.protocol.getversion.GetServerVersionHandler
com.adobe.flashaccess.sdk.protocol.getversion.GetServerVersionRequestMessage
For Primetime DRM SDK 4.0 or later, the response to a Get Server Version request indicates to clients that the server supports versions 3 and 4 of the Primetime DRM protocol.