In the final instalment of our series of previews on the five-year plan and policy address, to be announced on September 16, Natalie Wong and Matthew Cheng look at how national security spans areas such as finance and technology and what Hong Kong must do to earn Beijing’s trust. Read part one here, part two here, part three here and part four here.With the recent sentencing of former leaders of Hong Kong’s Tiananmen Square vigil concluding a key high-profile subversion case, it would be easy...