Generally you, the purchaser, are granted the right to make one backup copy of the original program. This copy is to be used only if the original is lost or destroyed. Each type of software has different copyright implications. Consult the technology resource person or media specialist in your building for more information on the licensing available for software in your building. Be sure to read the accompanying license agreement that comes with commercial software.
Individual licenses allow the user to install the program on only one computer at a time.
This means that a program you buy for your home computer cannot be installed on a computer in your classroom, unless the producer gives permission. Lab packs usually allow installation on 5 computers. A building site license will allow the program to be installed on all computers in that building. A district site license extends use to all computers in a school district. Network licensing allows all computers hooked up to that network to use the program.