Well guys,
I guess there cannot be more to add... more ways to protect (certainly something that would not involve cost). Summing it all for Criags sake...

1. If Criag wants everyone to read his tutorials and If Criag does not want to sell CDs then goto 2 else goto 4
2. Make the PDF version available for download and just forget about anyone else using it (in any way).
3. goto END
4. If Criag wants to sell a CD (which can again defeat his purpose, just as someone can buy a cd and then copy it, but only the number of people who want to do it gets reduced) then he does so.
Also, he can restrict the number of people downloading it, by using filters like, "The person is a member and has nothing less than x posts" etc etc.
5.
END:
END OF THREAD.

PS: Criag. I have a small suggession. Can you please use someother sign for threads closed because the Issue is resolved and people are happy. It is uncomfortable to see the CLOSE mark on the Successful thread that is just like the one for those out-of-way threads.

CHEERS,
HARSHA