In this handbook, we addressed the issues raised by a particular kind of trust sign, data protection seals, and we brought to light certain trends that are emerging in the developing digital landscape. The issue of seals is not a new one - seals have been around for a while in the energy and food industries -, yet digital goods are a specific and skyrocketing market that therefore cannot use solutions already tested elsewhere. The increasing data flows are thus compelling us to reconsider the issue of data protection governance modes in a new light...