As stated by others, the disks are not encrypted..so copying is not an issue.
Almost all cd/dvd burning apps (like ImgBurn, Roxio, Nero, cdburnerxp), all have the ability to read a source disk and make an image (ISO file). Once you make the ISO, you can then Burn a disk from an image and this creates a new cd/dvd from the ISO. And if the original disk was bootable, it will continue to be bootable when copied in this manner.