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Technically, to re-code a raw file into a basic DNG is not a problem. Chances that it will not be fully compatible with Adobe processing are about 70%. Here is just one example. For many Canon camera bodies Adobe are calculating baseline exposure compensation based on a special Canon tag in Makernotes. Adobe never disclosed that. So a third party is either to reverse engineer Adobe way (and for a yet unsupported camera it might be a problem), or the brightness will be different between an Adobe-produced DNG and a DNG converted by some other party. Anothe issue arizes with colour transforms. They can't be made forward-compatible with yet unknown colour transforms from Adobe or DxO. Neither DNG, nor XMP formats contain tags for black and white points in the sense you want them.