Cd rw protected

Hello,
i am abhishek kale,
i want to remove protection of a cd
without any software beause my hdd is full there is no blank space
my hdd is 20 gb i want to remove my protection with command in run
there is my importent cd of $25
it is used many times and i want to copy it but there is problem it is protected
can anybody help me i am very thankful to him please!