Originally Posted by epsilon

Not really, it's a BBC issue rather than an EETV issue. It is similar to how they encode their DASH audio streams over the internet to control access and prevent services such as Radio 1 Dance from working on Wi-Fi radios. They also, largely, have full control of their audio / video TV streams on other platforms so, if they wished, they could encode the streams so that they, say, need a live synchronisation signal from the internet. They could, technically, turn off the hypothetical synchronisation to time out recordings even without them being hosted on iPlayer.
The audio streams are, supposedly, encrypted so that they only work on BBC Sounds. In reality, they are designed not to work with the DASH stream implementation of Wi-Fi radios. The streams can be made to play on stand alone audio players.
That, by the way, is an actual technical point.