What do you mean by long-play writer? CD's can hold the amount of audio they are advertized to hold - a 74-minute disk holds 74 minutes of audio. It is possible to overburn the disk to get a bit more on it, though in my personal experience you can only get another 30-seconds or so onto the end of a disk, and half the players out there won't read that last bit. If you need to hold more CD-Audio, get bigger disks - 80-min disks are the same price as 74-min ones, and if you look around you can find them up to 99-minute (though some players and some writers won't be able to go to the end of such a disk)
If you need more audio than that, you need to resort to either multiple disks, or compressed audio (eg. mp3). The pros/cons of multiple disks are obvious, as for compression, you get to stay on a single disk for potentially 10x the amount of audio, but now it will only play on computers/MP3 players. The big advantage to compression is back in your copy-protection problem - you can apply a good DRM (digital rights management) technology to the compressed files to prevent unauthorized copying - if you are interested in that I would advise you go to microsofts web-site and read everything you can find about WMA9.
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