Register of producers : key facts and experience with the German register of producers with a view to Art. 39 of the Proposal for a Regulation on Packaging and Packaging Waste, amending Regulation (EU) 2019/1020 and Directive (EU) 2019/904, and repealing Directive 94/62/EC / Umweltbundesamt, Section III 1.6 Plastics and Packaging and Subsection Implementation of the German Packaging Act