Can there be multiple license servers per KID?

[wilaw]

[From https://github.com/Dash-Industry-Forum/dash.js/issues/3343]

When the keymessage is dispatched by the CDM we need to map the upcoming request to a license server. Is it possible that an MPD contains different license servers for different KIDs? In https://media.axprod.net/TestVectors/v7-MultiDRM-SingleKey/Manifest_1080p_ClearKey.mpd I can see that we have multiple clearkey:Laurlelements. Right now the code does not contain a mapping of the keymessage to the appropriate AdaptationSet. Instead I use the first clearkey:Laurl element I can find.

If a mapping is required how does it look like? Would I use the provided sessionId and save a mapping of sessionId to AdaptationSet/Representation? Or would I parse the keymessage, extract the KID/cenc:default_KID and search for that kid in the MPD?