You can install on two computer if the disk you have says it has more than one installation on it. If you received the same adobe package that I have then you should have two installations on your disk.
I'm not sure about any restrictions.
Hope I helped!
A DVD did accompany the product, along with a valid serial number, which represents the most vital portion of the purchase. Unfortunately, the DVD was not fully updated to reflect current OS X standards. However, I was able to download the most compatible version from adobe.com without being forced to invest in its subscription model, of which I disapprove.