What kind of tag are OGG and FLAC using for their metadata?

It's not all that different. These are the codec tag values I've seen:
mp3, vorbis, wma, wave
I suppose the flac codec name will be "flac".

V3.00-alpha3 supposedly supports drm-protected wma files.
I haven't tried any, but they get an extra tag: "drm=msasf".

Pim