I bought it. The service is rubbish. I guarded you like a thief. If you want to play the video, you must send the machine code, and they must give it to you to play it. When my machine breaks down, let them play it on another machine. Give me a word and get the company's consent. Communicate with them after buying it, and wait for half a day to reply. It takes 1 week to sell a video. Moreover, the following videos are just a few examples of clip drivers, and the gold content is not high. Frankly speaking, it is either an embedded engineer (not involving hardware, core) or a migrant worker who cultivates driver-level code.