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No pointers are given, where to buy, so can I consider http://shop.redhat.de/katalog/software as Retail or Corporate Reseller
Well, that example is flawed, and it seems you have a weird understanding of what "resale" is.
what about https://www.europe.redhat.com/shop/en/ ?
As the whole point of my statements, I come to the conclusion that the information from the various redhat sites are (at least for me) a bit confusing. Maybe also my own readings are not thorough enoaugh;:), but the communication by the redhat websites are at least suboptimal (imho). But its ok, and no longer worth of discusion;-) Thanks, for your patience