Copyright and Fair Use LR

The question that I have decided to create a long response on is question number two. As long as no one is using the software simultaneously, than it is completely allowed for the school to only have one license. If this was the case though, who is the one punishable if the school exceeds the limit. The student can not be at fault since they had absolutely no idea that they were violating the law. The school can not be responsible if they are do not catch the mistake quick enough to see the student on the software. I also have thought a license means it is only allowed to be on one computer, according to this you could put it on 10,000 computers as long as only one is using it. I personally am against this, I believe that a software should be only allowed to be uploaded to three different computers, after this they should have to buy the software again. A couple questions I have are: How is this law enforced? What happens if a school goes above the amount of licenses they own? How easy is it for the school to be able to buy another license?