K9Copy
K9copy is a DVD authoring program for the Linux operating system.
It is generally seen as the Linux equivalent of the Windows-based DVD Shrink, as it shrinks a DVD-9 DVD down to a DVD-5 DVD, allowing for movies on dual layer DVDs to be shrunk down in order to fit on a single layer DVD.
The program allows the user to have the shrunken down DVD written to the hard drive as an ISO image which can then be burned to a DVD recordable by using a CD/DVD burning program such as K3b.
Like DVD Shrink, k9copy is also useful for circumventing copy protection that normally leads to an "input/output error".