You can register any brand, name or set of letters for a domain, provided it is available on the Internet.
However, if you register a trademark or trade name, it is important that the legal representative of the registration is aware of what you are doing with their approval. If your site is commercial, but your website or company has no relationship to the brand or is in a different market or category, you should generally not worry. However, if you register a domain name with the only object of exploiting another brand, confuse users or take commercial advantages of a third party brand, the legal representatives could request to invalidate or dispute your name on the Internet.
In such eventuality, the ICANN usually resolves conflicts in favor of the original trademark owner. In case of disputes, Netz0 will act according to the legal provisions and ICANN regulations regarding domain dispute resolutions.
Netz0 does not request any special documentation or information to register a domain name except for certain extensions that explicitly require extra documentation. The responsibility of a name is on the person making the registration. Registering a domain name does not automatically grant commercial rights or trademarks over such name, if this is what you need, you should register or manage the trademark for your domain on your own.