Yes, aptx is a Qualcomm exclusive patent, so you can only use this patented technology if you buy Qualcomm hardware. aptx this coding technology was originally from the CSR manufacturer, and later Qualcomm wholly acquired CSR, so it was returned to Qualcomm together with the apt-x patent. This means that the adapters you buy for Bluetooth chips from RealTek, Broadcom, Loda, Actions, Wind Tunnel, Henghyun, Jerry, and so on will not be able to use this technology.
This is just a standard proposed by Qualcomm, as long as it meets this standard, it is supported