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I have read the EU directive. It does not mention the word DAB or DAB+ but use the words digital radio instead.
It should be noted that digital radio is used by mobile broadband as well as DRM.
Many new radios use software designed radios. DRM and DAB+ signal processing are identical except for some parameter settings. The major difference between the DAB+ and DRM is just the filter used to select the frequency the user wishes to listen to.
DAB+ is the highest frequency used by broadcast radio and as a result has the smallest coverage area. DRM will work at many lower frequencies, extending the coverage area and minimises the size of black spots.