Would the Daily Mail website fall foul of the online porn filters it has championed?

Ban this sick filth. No, not THIS sick filth, obviously.

David Cameron wants to block online porn, the Daily Mail reported approvingly this morning.

 

Now comes the big question: where the line should be drawn. If you're too lax, things slip through the filter; if you're too strict, non-pornographic images or sites get caught in the net. How do you tell what's pornographic and what isn't? "I know it when I see it," said Justice Potter Stewart in 1964. But it isn't that simple.

Despite the best efforts of programmers everywhere, you can't just tell a computer "block any page with an image or video of a female nipple or male or female genitalia" (a rule which, itself, would be hopelessly over-strict; farewell Titian! So long, Leonardo!). Instead, most blocking software uses contextual clues on the page to work out whether the site itself is problematic. That can be obvious: there are few safe-for-work sites which use the phrase "double penetration", for instance. Except this site, now – which explains part of the issue.

Existing filters show that if you want to make the blocking comprehensive, some of the contextual clues used have to be broad enough to make collateral damage certain. Blocking anatomical terms like "vagina" or "anus", for instance, frequently leads to sites discussing sexual health or feminist topics being caught up.

Meanwhile, humans - being cleverer than filters - learn to use terms which can't be blocked because they also have innocuous uses. (Take, at the extreme end, the use of "Lolita" to denote images of child abuse.)

The thing is, even if all the technological quirks were worked out, drawing the line is still hard, just in terms of choosing how prudish we as a nation are. So where do we start blocking?

Pictures of women in their underwear?

 

 

Sexual, nude but non-explicit photos?

 

 

Pictures of women with clearly visible breasts?

 

 

Topless pictures of prostitutes in 1940s Paris?

 

 

Playboy style photo-shoots?

 

 

Non-explicit pictures of people having sex?

 

 

Well, would you want your children seeing that kind of material? Ban this sick filth.

Oh, Daily Mail. Photograph: dailymail.co.uk

Alex Hern is a technology reporter for the Guardian. He was formerly staff writer at the New Statesman. You should follow Alex on Twitter.

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Theresa May could live to regret not putting Article 50 to a vote sooner

Today's Morning Call.

Theresa May will reveal her plan to Parliament, Downing Street has confirmed. They will seek to amend Labour's motion on Article 50 adding a note of support for the principle of triggering Article 50 by March 2017, in a bid to flush out the diehard Remainers.

Has the PM retreated under heavy fire or pulled off a clever gambit to take the wind out of Labour's sails while keeping her Brexit deal close to her chest? 

Well, as ever, you pays your money and you makes your choice. "May forced to reveal Brexit plan to head off Tory revolt" is the Guardian's splash. "PM caves in on plans for Brexit" is the i's take. "May goes into battle for Brexit" is the Telegraph's, while Ukip's Pravda aka the Express goes for "MPs to vote on EU exit today".

Who's right? Well, it's a bit of both. That the government has only conceded to reveal "a plan" might mean further banalities on a par with the PM's one-liner yesterday that she was seeking a "red white and blue Brexit" ie a special British deal. And they've been aided by a rare error by Labour's new star signing Keir Starmer. Hindsight is 20:20, but if he'd demanded a full-blown white paper the government would be in a trickier spot now. 

But make no mistake: the PM didn't want to be here. It's worth noting that if she had submitted Article 50 to a parliamentary vote at the start of the parliamentary year, when Labour's frontbench was still cobbled together from scotch-tape and Paul Flynn and the only opposition MP seemed to be Nicky Morgan, she'd have passed it by now - or, better still for the Tory party, she'd be in possession of a perfect excuse to reestablish the Conservative majority in the House of Lords. May's caution made her PM while her more reckless colleagues detonated - but she may have cause to regret her caution over the coming months and years.

PANNICK! AT THE SUPREME COURT

David Pannick, Gina Miller's barrister, has told the Supreme Court that it would be "quite extraordinary" if the government's case were upheld, as it would mean ministers could use prerogative powers to reduce a swathe of rights without parliamentary appeal. The case hinges on the question of whether or not triggering Article 50 represents a loss of rights, something only the legislature can do.  Jane Croft has the details in the FT 

SOMETHING OF A GAMBLE

Ministers are contemplating doing a deal with Nicola Sturgeon that would allow her to hold a second independence referendum, but only after Brexit is completed, Lindsay McIntosh reports in the Times. The right to hold a referendum is a reserved power. 

A BURKISH MOVE

Angela Merkel told a cheering crowd at the CDU conference that, where possible, the full-face veil should be banned in Germany. Although the remarks are being widely reported in the British press as a "U-Turn", Merkel has previously said the face veil is incompatible with integration and has called from them to be banned "where possible". In a boost for the Chancellor, Merkel was re-elected as party chairman with 89.5 per cent of the vote. Stefan Wagstyl has the story in the FT.

SOMEWHERE A CLOCK IS TICKING

Michael Barnier, the EU's chief Brexit negotiator, has reminded the United Kingdom that they will have just 15 to 18 months to negotiate the terms of exit when Article 50 is triggered, as the remaining time will be needed for the deal to secure legislative appeal.

LEN'S LAST STAND?

Len McCluskey has quit as general secretary of Unite in order to run for a third term, triggering a power struggle with big consequences for the Labour party. Though he starts as the frontrunner, he is more vulnerable now than he was in 2013. I write on his chances and possible opposition here.

AND NOW FOR SOMETHING COMPLETELY DIFFERENT

Emad asks if One Night Stand provides the most compelling account of sex and relationships in video games yet.

MUST READS

Theresa May is becoming adept at avoiding defeats says George

Liv Constable-Maxwell on what the Supreme Court protesters want

Theresa May risks becoming an accidental Europe wrecker, says Rafael Behr

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Stephen Bush is special correspondent at the New Statesman. His daily briefing, Morning Call, provides a quick and essential guide to British politics.