I want to install CC on 3 computers - home, office and laptop. Do I have to buy an additional subscription to do this?
You may install software on up to two computers. These two computers can be Windows, Mac OS, or one each.
If you install on a third computer, it will request you to De-activate on the other two computers. You can then reactivate one of the previous two computers, and use Creative Cloud apps on it.
If you regularly need to use the Creative Cloud on more than two computers then it would be best to purchase an additional subscription. This is the same licensing btw which we have for our perpetual product. An advantage though for Creative Cloud over the perpetural product is that you can install on Mac and Windows with the same subscription!
Let me know if you need more assistance.