Lightscribe is a protected technology, but it's not something overly sophisticated. Check the FAQ or website of your CD/DVD burning tool for infos.
The K3b burning tool's download page has a download link to the LaCie LightScribe Labeler (see
http://k3b.plainblack.com/download and
http://k3b.plainblack.com/download#7...tyZ7H6bXbWiTaQ), in case that you are using K3b.
If everything else fails, you can till download the Nero burning tool's Linux version - Nero should be able to do it, though it's commercial (some people mind commercial apps).
Linux Archive