Finally new HTTP status code 451 was approved by IETF. RFC will be shortly delivered.
I’m wondering who can response this code. Because when user accessed the page, the censored document will be correctly passed to user, it means censorship organization or person avoids to let user know fact that be censored. Internet Provider or some service provider can response the code without presser from anyone. It must be rare case to notice the fact.
According to some internet article about this, there were so many type of the opinion for agree or disagree. Code space is limited, it’s good to collect the fact that there are some censorship on internet and so on.
In near future, statistic report about this will be revealed by lab and internet research company. I’m looking forward to see the result.