Unixcop published a tutorial about how to modify the Proxmox repositories.
How to modify the Proxmox repositories
When we refresh the Proxmox repositories we get an error stating that our IP address is not authorized to access a repository. Well, this repository gives us access to enterprise packages and to use it you must have a valid license.
How to modify the Proxmox repositories - Unixcop the Unix / Linux the admins deams