As the main developer of the MAcMapHS6 project at CEPII, David Laborde has continued to work on the database in collaboration with CEPII. The dataset is used for both internal (e.g. MIRAGE simulations) and external projects (e.g. GTAP 7) as the backbone of any applied works on trade policies.
For detailed documentation of the MAcMapHS6v2 database, including a rich description of the world trade policies in 2004 and the changes occurring between 2001 and 2004, see the IFPRI discussion paper, A picture of tariff protection across the World in 2004.