David Kenny, associate professor at Trinity College Dublin Law School, is back with us to take us through the EU-Canada Trade Agreement, or Ceta. What is it, what are the main sticking points, and why did the Supreme Court rule that it couldn't be ratified without a referendum in Ireland (as it stands, at least)?The Explainer is brought to you by The Journal. Providing open access to valuable journalism in Ireland has been the aim of The Journal for a decade. You can contribute to ensure we can keep questioning, investigating, debunking, explaining and informing at www.thejournal.ie/contribute/