New tools would limit backups from ordinary CDs and prevent burned versions from being used to create further copies. And the effort could also carry over to services such as iTunes.

Record labels and Microsoft are in discussions about ways that the next generation of the Windows operating system, code-named Longhorn, can support copy-protected CD technology. The music labels ...

Record labels say CD sales have plummeted as a result of copies--and copies of copies. Now the labels are testing technology that would limit the number of times a CD, or its copy, could be burned ...