Crash course:

• Download miniunbzip.tar.gz, zlib-1.2.3 and bzip2-1.0.3 in a local directory.
• Unpack miniunbzip.tar.gz (tar -xzf miniunbzip.tar.gz).
• Execute miniunbzip script.
• For legally oriented, execute `grep "^#" miniunbzip | sed '1d'` to display all the copyrights.