At issue is the unsavoury trade in Nazi memorabilia which can be bought over the Net at Yahoo's auction site.
Some items are genuine historic relics.
Others are copies without even the justification of history for purchase. The court is now hearing a wealth of technical evidence over whether such a block is possible. Technically, the answer is just about yes - filters could effectively restrict access to about 90 per cent of French surfers. And this is where the argument gets even more involved. For anyone with a modicum of technical know-how, filters can be circumvented.