1) One license per PC.
2) In general, there is a manual activation, see the FAQ.
3) In fact, the game activates on StarForce server. What will be if the Internet stops, apocalypse comes, the lobster whistles - I don't know, actually nobody knows. If you are asking about serial numbers, then first of all, I should tell that we replace serial numbers for BS purchased in our web shop only. Secondly, nobody knows.