ProTools requires an iLok. End of story there.
http://www.musiciansfriend.com/product/Digidesign-iLok-USB-Key?sku=241800&src=3SOSWXXA
They're only $40.
That's 4 dimes bags, 4 pints of Jack Daniels, a few cases of mid-grade beer, 1 porn DVD (or several of them rented)... Just pull ya...