Patronato

Patronato was an intermediary stage between slavery and freedom in most Latin American countries, when the children of slaves served as apprentice to the slave master--most of the slave child's productive years to early twenties, and freed at 21. The intermediary stage was stipulated in most Free Womb Laws. Some in the patronato were paid others weren't, depending on the country. In Brazil they were paid, but in Cuba they weren't. 

In the British territories, this was refered to as apprenticeship, after the Emancipation Act of 1833. Individuals were paid.