Remove write protection from disk

If it's a "write once" CD/DVD that's been "finalised" (ie no more files can be written to it), you can't remove it's write protection because that's an inherent property of the disc.

If it's a re-writeable CD/DVD, you can remove it's write protection by "erasing" the disc which makes it a blank (empty) disc again. You can erase it by using disc-burning software like Nero.

If you are referring to some other type of disk or drive, please post on the appropriate forum as this forum is only for CD/DVD drives.