The Communication Security and Surveillance Act Article 29

If any one of the following conditions is met when conducting surveillance on other people's communications, it is not punishable:1. It is conducted pursuant to the law.2. Employees of telecommunications enterprises and those who set up public telecommunications networks and postal enterprises conducted the surveillance based on the objective of providing public telecommunications, public telecommunications networks or postal services in accordance with the relevant laws.3. The person conducting the surveillance is one of the parties in communication, or has obtained consent from one of the parties in communication, and the conduct is not for illegal purpose.