Hi, let's say that someone would be thinking of selling Smartphones well-compatible with Ubuntu Touch and having that system preinstalled on them (and unmodified in any way), what would they need to know about the licenses of the project and how to comply with them perfectly to satisfy both the project and the potential seller's need for having a peace of mind?

Note: I do wish to mention that obviously the customer would be informed constructively of benefits and potential drawbacks before purchasing such a device, and they would also be informed that the seller is in no way affiliated with the UBports or the Ubuntu Touch project itself and the system preinstalled is unmodified. Also, some of the seller's profit would happily turn into donations made to the Ubuntu Touch project.