How to guard against bicycle thieves? Don't mention the 24-hour surveillance video. The camera often generates a large amount of image data. Even if the theft is recorded, it is often ignored during playback. In Britain, where surveillance video is very popular, more than 500,000 bicycles are stolen every year, of which less than 5% can finally return to their original owners.
The passage mainly explains that you should be more careful when playing back surveillance video data.