My operating system's final project entailed developing a self-picked project. Any project was fine as long as it was related to the core principles of the course. I ended up receiving permission to futher develop netcat's Cycles per Instruction linux kernel module.
Netcat is a group from Seatle and they were the first to release songs from their album as a linux kernel module.
The idea behind it was that their songs would be 'encoded' in such a way that no one would be able to listen to them without using their kernel module.
The magic happens in the following fashion:
1) Get an ogg file and open it as binary file
2) Read every byte in the file and think of it as a number in the range [0...255]
3) Transform this number to a string of 6 characters (bytes) representing the number in hexadecimal
4) Write down each string to a text file -> the array format
The ogg file would have then been transformed into an "array" that would give any music player a headache.
Each track is associated with a .c (trk1.c) file, which simply initialized an array with the contents of the corresponding array track file (trk1data.h). when this file is compiled the hexadecimal string goes back to binary.