Yes, you can share.
Yes, you can share.
Guys I am a poor fellow and i have a desire for pcs i have built them as well! i want to get windows for two new pcs i have and i want to know if i can share one product key with 2 pcs. i will be keeping them both for myself and not selling them. they are mine... BEFORE you start asking why don't you have one that can do what two can, i will tell you it is so others can come hangout and play with me at my house! i want windows 8.1 because i love it so dont recommend anything free or another program. i tried getting student versoin (as i am a student) and i never got a response. ready set go!
Only one PC may use the licence at a time. For two computers you'll need two licences. This doesn't prevent installing 8.1 on both devices. EDIT: I should have noted that some licences support multiple PCs, though they're meant for business. Those tend to be much pricier. If your users are schools or businesses... personal use won't be available.
I’ll need to purchase two physical copies (hard copies are more affordable) for each of my separate computers. That’s a bit of a hassle, but it’ll save money in the long run. As for the disk after installation, there’s no specific reason to retain it unless you plan to use it for backup or recovery purposes.
They will be helpful later, just reinstall them if needed. You can also use them to recover an installation, as mentioned before.
It will definitely be a hassle to reinstall four times a year, so he might try to bypass the system just to avoid it, which is definitely against the rules. (We can't suggest breaking into the OS here because CoC)