The article implies that it's human-made:
Quote:
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A list of illegal sites compiled by the Internet Watch Foundation, the industry's watchdog, has been available for some time, but until now there has been no way to prevent people accessing them because most are based outside the UK." (Guardian)
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Its slightly unclear though Ñ it talks about per-image blocking, which seems a bit... odd.
God, you'd hate to be the person who had to compile the list. What a horrible job.