Private/internal repositories limit package access to authorised clients and users, without sharing packages to the world. If you need internal software distribution mechanics, or if you want to support license-based software distribution, then private repositories facilitates these.
Access your packages via a white-labelled domain specified by you. If your company brand and trust is important to you and your customers, whitelabelling will allow you to present your own company's domain as the endpoint for storage and configuration such as GPG keys, install scripts, etc.
Restrict or grant access to your packages based on geographical location, IP ranges or specific IP addresses. If you need to add physical location security to your package management, then Geo/IP Restriction is what you need.