Ubuntu's multiverse repository section

Ubuntu is porting most of debian's non-free archive as well, but they can't distribute it as freely as the main archive (see ​it explained in the ubuntu faq). So debian's non-free and contrib sections have been translated by ubuntu to their multiverse section.

Often programs in non-free are not free because they discriminate against fields of endeavor (e.g. pgplot, which is required non-commercial), or don't allow free modification of the source (e.g. pine or djbdns).

Everything in that archive is at least free for ubuntu to distribute directly, but they make no representation about if any specific end user or group is free to use it or to re-distribute it. By ​policy, each installed package must include copyright and licensing information in /usr/share/doc/<pkgname>/copyright, which is worth reviewing when installing a package to ensure that we can legally use it within CAL.