term:

Pirate

pirate n

: a person who commits piracy
vb pi·rat·ed
pi·rat·ing
vt
: to take or appropriate by piracy
;esp
: to copy, distribute, or use without authorization esp. in infringement of copyright [the pirated software] [pirating cable signals]
vi
: to commit piracy compare bootleg

Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.