VRM's meta block encodes commercial use, redistribution and modification per asset; REUSE standardises per-file license tags; CC and ODbL define their own conditions. None of the sources read include a model-training field. Can one schema cover hosting, redistribution, modification and training for assets and datasets?
Why this is still open: The sources define overlapping but incompatible fields; mapping them was not attempted and training permissions are absent from all read.