What are these repositories for?

English Applications
1

OpenSUSE 12.2 – KDE 4.8.5

I was wondering what the following partially disabled repositories are for:

Are they essential, can I delete them or is it better to leave them the way they are now?

2

this is the repository to retrieve libdvdcss which is required to be able to watch encrypted movie DVDs, usually needed by kaffeine , vlc and many others.

Are they essential, can I delete them or is it better to leave them the way they are now?

these are standard repositories and could be essential if you want to debug or look at sources.

it is up to you to remove them or not but they can also stay there.