is there an easy way to password protect a full cd.

ive made some programs which i am placing onto a multimedia cd and ideally i would like to protect the cd itself with a serial number and password combo.

this would stop unauthorised people downloading and using the cd etc.

not sure if there is anything like this though? ive searched google and have found lots of programs that protect .exe's but there are expensive and that way i would have to protect every single file which would be very time consuming.

any help appreciated