Some websites indicate the need to obtain Bluetooth certification.
I am aware of the high cost of registering a product when rebranding, even when incorporating a product that already has Bluetooth certification.
I would expect that if one does not use the Bluetooth patent and logo, one does not need to obtain Bluetooth certification, but I do not know how to avoid using the Bluetooth patent.
Is the Bluetooth patent included in the hardware or in a specific library?
Bluetooth SIG : Bluetooth Qualification Process Overview
https://www.bluetooth.com/develop-with-bluetooth/qualification-listing/
Do I Need to Qualify?
https://support.bluetooth.com/hc/en-us/articles/360049018272-Do-I-Need-to-Qualify-
Bluetooth認証の必要性とSIG認証のための工数・費用の削減する方法とは？
https://www.tjsys.co.jp/embedded/netnucleus-bt/bt-certify-costcut.htm