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3 comments
The answer is - both!
DT Swiss freehub and body with Shimano splines to match your Shimano cassette.
Or, it seems the story isn't quite as simple as I thought, having read this page. I think the exact Shimano system is still covered by patent.
Freehubs are part of the hub, so it is a DT Swiss component.
Freehub / cassette system was invented by Shimano, and replaced the old system of a separate hub and screw on freewheel + sprockets. The old system was bad because the drive side bearing was some distance from the dropout, and this put stress on the axle, which used to regularly bend or break.