I’d argue intellectual property existed earlier than that, as soon as states (or guilds) considered certain techniques and skills exclusive to them.

Off the top of my mind, with a solely European view the Venetians moved glass production to Murano in the 13th century at least partially to make a monopoly on luxury glass. World History was awhile ago but other restrictions on technology transfer existed by at least 800 CE and probably in a limited sense well before 1000 BCE.