A leak from the negotiating table of the Transatlantic Trade and Investment Partnership (TTIP) has shed light on trade talks that could reshape the economic relationship between the US and the European Union (EU).

But what is the TTIP and why do we know so little about it? 

The stated purpose of the TTIP is to liberalise roughly one-third of global trade. Its proponents say it will reduce tariffs and regulatory barriers and create jobs. 

But its opponents, including Greenpeace, which made the leaks public, warn that it could allow corporations to rewrite the rules on the environment, health, product standards and even allow them to challenge government policies that get in the way of profits.

The negotiations, which could have implications that go far beyond trade, are being held in secret. In fact, almost all the information we have on the TTIP has come from leaks. 

This is not a trade story. This is a story that touches on all of these different elements of our daily lives.

Melinda St Louis, international campaigns director, Public Citizen

The EU has banned the negotiating documents behind the TTIP from being made public for 30 years because of what it calls their "sensitive nature". 

With so little tangible material to report on and so much impassioned opposition, where does this leave journalists looking to cover the TTIP story?

We analyse the coverage, the secrecy surrounding the talks and the barriers to reporting on a story unfolding largely in secret.  

Talking us through this are:

Daniel Rosario, the EU Commission spokesman for trade and agriculture

Alberto Alemanno, a professor of law at HEC Paris

Faiza Oulahsen, a Greenpeace campaigner

Hans von der Burchard, a reporter at Politico

Melinda St Louis, the international campaigns director for Public Citizen

Source: Al Jazeera