According to the copyright law of Thailand, schools can use copyrighted software to teach students without licensing for a period of time and they must provide a proper license as soon as possible.
However, this may not fair to courseware developers since the creation of every single educational software has running cost. Many educational courseware vendor decided to protect their licenses using a special hard lock tool, as shown in the picture below.
Hard lock is a digital device used to control the use of specific software according to its license. It can be in the form of USB device, parallel connector, or even a copy-protected CD. A program, once starts, will generate a highly-encrypted code and send to the hard lock in which the response will be submitted back and grant the use of the program if two codes are matched.