Is it legal in judo?

https://www.youtube.com/watch?v=FErwbC09ZsI

Is the move shown at 0:24 allowed in a judo shiai, during ne waza? I mean when he grabs opponent legs and rolls.

Sure, why not?

With IJF rules you never know...

You have to blame Kano Jigoro, that leg locks are banned in competition Judo and Randori:

"According to Contest Judo, by Roy Inman (1987), the Dai Nippon Butokukai, under the direction of Jigoro Kano, banned locks of the fingers, toes, wrists and ankles in jujutsu/judo contests in 1899. In 1916, ashi garami (knee entanglement, twisting knee lock), and dojime (trunk/kidney squeeze, performed from a body scissors) were banned by the Kodokan. Apparently, there were a number of serious injuries which resulted from the use of these techniques. Joint lock attacks in Judo contests were limited to the elbow only in 1925."

http://judoinfo.com/rules2.htm

Anatol wrote:You have to blame Kano Jigoro, that leg locks are banned in competition Judo and Randori:

"According to Contest Judo, by Roy Inman (1987), the Dai Nippon Butokukai, under the direction of Jigoro Kano, banned locks of the fingers, toes, wrists and ankles in jujutsu/judo contests in 1899. In 1916, ashi garami (knee entanglement, twisting knee lock), and dojime (trunk/kidney squeeze, performed from a body scissors) were banned by the Kodokan. Apparently, there were a number of serious injuries which resulted from the use of these techniques. Joint lock attacks in Judo contests were limited to the elbow only in 1925."

http://judoinfo.com/rules2.htm

Yes I know. But the technique shown in the video isn't a leg lock, but spinning with the opponent while holding him by the legs.

looks quite effective to get him moving, but then you need some way to stop him on his back ... i guess you'd have to try to grab up high on his right lapel. I'll play around with this movement, thanks!

But the technique shown in the video isn't a leg lock, but a turning with the opponent while holding him by the legs.

Yes I know, but a leg lock would be very effective in this position. Better than turning.

Turning the opponent by gripping  the legs of the opponent in Ne waza is legal.

Why should it be illegal?

Yes this is legal no problem, but has it's drawbacks under judo rules.
In wrestling you score for the turnover and can score repeatedly if you do it again. In judo no score until you achieve osaekomi and hold it for 10 seconds minimum, and it doesn't really lead directly to any kind of sub, not even a leglock were they permitted. Like the gut wrench, it's kind of specific to wrestling due to the particularities the rules.

All that said, because it's so rarely seen in Judo I have been able to surprise people with it and turn them on their back before scrambling to move the control to their upper bodies. Chances of success drop dramatically with more experienced opponents as the control is so far from the torso. You need to stop the roll while they're on their back and snag some grip on the upper body. Best achieved if you can get them to bend at the waist so you are closer to the shoulders when you move to shift your control from the ankles to the upper body.

There is a reason this is rarely seen in judo.