Because of download restriction, I would like to know if it is possible to install LibreOffice (or other software) from Ubuntu 12.04 DVD to Ubuntu studio?
I have Ubuntu studio 12.04 installed and have Ubuntu 12.04 DVD.
In short answer - No, You can't. Because the openoffice is installed in the Live filesystem of Ubuntu DVD ( they are not in .deb format)
Long answer - yes. You can use the installed packages in the Live filesystem by repacking those packages, This is a complicated way ( but, I used this method once ) See the question Can I use Kubuntu Live CD to install kubuntu-desktop package on a Ubuntu installation? for details