linux (repo ?)

I am on a debian-based linux os's a variation of ubuntu... I am curious though how the repositories are broken down. I found this on the internet Quote: The repository components are: Main - Officially supported software. Restricted - Supported software that is not available under a completely free license. Universe - Community maintained software, i.e. not officially supported software. Multiverse - Software that is not free. Does the differences in what you can do legally with the different repo software. For example I can download multiverse software like dvdstyler ,...etc And use it freely. Does the "not free part" come from the fact you cann't get the source code or just redistribute a modified copy, or both ? Also is the only difference between whats under the universe repo to whats under the main repo just the fact that the main repo would held at a higher guarantee of quality? Where as the universe repo doesn't guarantee you anything in terms of functionality and quality? And I am assuming the restrict repo is only different from main repo in that the software source is not available. Do I got the repo's correct or am I missing something?

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