Ubuntu's multiverse repository section

Ubuntu GNU/Linux 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 ("as in freedom") 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). This might not affect CAL's use of a package, however.

Everything in that archive is at least legitimate for ubuntu to distribute directly at no charge, 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 that package within CAL, or if we need to deal with licensing issues.

Packages installed from ubuntu's main or universe sections should be fine to redistribute within CAL without worrying.