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