I am new to Video SL and am looking into purchasing it, but in my bussiness I always carry two laptops with me. My Macbook which is my main laptop and a pc which is my backup in case anything ever goes wrong. Can I load Video SL on both computers without having to authorize or deauthorize every time or do I need to purchase Video SL for each computer? My main concern is that if my mac was to crash I wouldn't be able to de-authorize it. Thanks