The Dutch like it cheap. We do not like rules. That's just the way we are. The people at NOS are no different. They have a contract with UEFA (or so they say) which requires them to broadcast the games of the European Championship only in DRM format.
NOS is using this as an excuse to pendel Microsoft malware.
Well, guess what? They also broadcast it without DRM. The stream is a proprietary protocol, but it is not encrypted. You can even play it under Linux.
We call this 'van twee walletjes eten' (eating from two dykes) or 'pappen en nathouden'.