Does anyone know of a way to copy-protect image CDs?

I've just come back from photographing a Swiss wrestling (Lutte) festival. I went privately, but when one of the organisers saw me at work he asked if I sold my photos. I said 'yes' and became the sort of official photographer on the spot. 

He wants me to send them a CD of the images. I know you can watermark photos, but I'd like to protect my investment of time, knowledge and equipment, not to mention copyright, by making the whole CD copy-protected. This means that I can sell the CDs to individuals, secure (I hope) in the knowledge that they can't be copied and distributed within the wrestling club.

Can this be done? All advice gratefully received.

There is no fool-proof way to protect CDs or DVDs.  All you have to do is look at the movie and music industry to understand that.  They are multi-billion dollar industries and they can't even stop thieves from stealing their property.

Take the extra time to put the watermarks on the images.  It is the only way to really protect yourself.

Or as sharply_done suggest, provide a very low resolution image.  I would suggest around 200-300 pixels at the widest (since that is what most sites use for their thumbnails).

Put them on the web.  that way they can distribute the link easily and buy the ones they want?

Does Flickr have a payment option yet?  I know Zooomr is still alpha testing there version.  or smartmug?  Alternatively Featurepics may accept them as editorial and have them up there for a while?