This will happen to Jade Satellite TV, Hong Kong Satellite TV and Phoenix Satellite TV in Guangdong. When Emerald Channel and local Hong Kong and Taiwan broadcast news, sensitive news will suddenly insert advertisements or "Hong Kong Today", while Phoenix Satellite TV and Australia Asia Satellite TV will use the picture of welcoming pine to block it. If there are sensitive contents and discordant news under the subtitles of news programs, there will also be blue bars covering the subtitles.
Because some places//people in power don't want some information consultation to be known to the masses, such as newspapers being read every day, officials being investigated, people going out for a walk to express their demands, and enlightened people are often blocked.