For anyone not sure of the difference between this and most countries where companies have to comply with police requests, the big difference is that HK police no longer requires a warrant. HK Police may now demand data from companies such as Facebook without a warrant, it should be interesting to see how these companies handle it.
A similar vein of thought but much much broader. It Allows for the collection of content data by local law enforcement as opposed to the NSL "By law, NSLs can request only non-content information, for example, transactional records and phone numbers dialed, but never the content of telephone calls or e-mails."[0]
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[ 3.2 ms ] story [ 21.6 ms ] thread[0] https://en.wikipedia.org/wiki/National_security_letter