Theft--theft is a felony; it is the taking of someone elses property with the intention of permanently depriving that person of it.
What these pirates are doing is illegal and wrong--but it's not legally theft.
"Theft--theft is a felony; it is the taking of someone elses property with the intention of permanently depriving that person of it."
Theft is NOT always a felony, and theft does NOT always means depravation.