As far as the legality of doing what was suggested by Rickertsen, I point you to the Klutztown incident.
Basically, the Klutztown school district issued iBooks to all high school students. Naturally, they had a lot of restrictions. However, the password they had used for the administration system was written on every single serial number label (on the bottom of the iBook.) Naturally, about 80-100 students abused this and removed all administration software from their iBooks.
These students were charged with Computer Trespassing (a third-degree felony)
and were suspended/expelled from school. Whether or not the punishment fit the crime, i'm out of my jurisdiction to decide. After a flood of media came in questioning the school board, the charges were eventually dropped. To be honest, I think the school district should've been charged with Criminal Negligence if the students were charged...
Couple links about it
Local news article about Klutztown Computer Scandal
Slashdot | Felony Charges For H.S. Hacking
Slashdot | Klutztown Students get Felony Charges
Slashdot | Charges Against High School Hackers Dropped