2. The hotel's opening record is kept for a long time, and it will be even longer if it is transmitted to the public security system. The preservation time of hotel monitoring is generally about one month, and some are less than one month. Because the surveillance video file is relatively large, the earliest surveillance video will be automatically deleted when the hard disk is almost full, depending on the size of the hotel hard disk. It doesn't have to be like this. Knowing the other party's ID number, you can find out the opening records of all provinces in the country within three years, and you can also find out the information of the other party's roommate. Including time, hotel name, location and room number. From the perspective of protecting customers' privacy, hotels are generally reluctant to provide customers' corresponding information unless they go through the public security department. Of course, you can also consult the hotel to see if you can get the corresponding information. However, if there are only public records, from a legal point of view, it cannot completely prove that the other party is having an affair.