This is the best tl;dr I could make, original reduced by 90%. (I'm a bot)

> The library at Hong Kong's top university has introduced a new system under which readers must register in advance to gain access to some politically sensitive books or archive materials.

> Previously, users of the Special Collections section did not have to make bookings in advance or register books they wished to consult.

> When HKFP visited the library last month, five politically sensitive books - either written by activists or dealing with the 1989 Tiananmen crackdown - were available only in the Special Collections section.

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