.DE will not be the issue since many European registrars use an admin contact located in Germany and this allows registrations outside of Germany.
EU/IT/FR are more strict as Siberforum correctly pointed out. Though in some cases like for example .FR trustee addresses are being used. And i think Eurodns gives you a certificate when you register a .IT with them to proof domain ownership.
Are you resident of all those countries those domain names belong to?
Most of them requries to be resident of the country they belong to.
I think you're about ten years behind the time here. Most European ccTLDs are now open (i.e., anyone can register). Where local presence requirements exist they can usually be got round by using a local address supplied by the registrar. There are a few that are still difficult to get (last I heard .no domains were still only available to companies incorporated in Norway) but most European ccTLDs are now quite easy to register.