Source: http://support.na.square-enix.com/fa...6&id=5382&la=1
Real Money Trading (“RMT”). RMT is the selling and buying of virtual assets for real-world money, property, or services. “Virtual assets” include, but are not limited to, the following:

· Accounts

· Characters

· In-game currency (gil)

· In-game services

· In-game items or gift codes

· In-game property
Also from the eu site (couldn't find a NA site version): http://support.eu.square-enix.com/ru...=giftcodeterms