[Lizard]

You probably only need one, but here's the relevant text from our licensing page:

"Our products are usually licensed for a given number of computers or users, whichever is lower. For instance, one person with both a laptop and a desktop computer (or, say, a home machine and an office machine) can legally install and use a single license on both computers, though not at the same time. Similarly, a home computer shared by three family members needs only a single license of the software."