2.2.3.1.1 Silent and Nonsilent Requests
The DRM version 7 client can generate either a silent or a nonsilent license request. By contrast, version 1 clients always generate a nonsilent license request.
Silent license acquisition means that the client application SHOULD NOT display a license acquisition user interface, which requires active user input, to the end user. A client application MAY display some form of progress indicator.
Conversely, nonsilent license acquisition means that the client application MAY display a license acquisition user interface, which requires active user input, to the end user.