Hello.
I'm bidding but actually it's just to give you some advice. When it comes about CD/DVD copy protection, there is no 100% effective protection method. Actually, that's why all companies are selling their products online. That way you can provide your buyer a serial number to authorize him/her to download the tutorials you're selling.
In conclusion, my advice is "don't sell it as a disc". It's better to sell it in a digital format instead.
That way you don't spend money on discs and copy protection will be better (yet not perfect).
You don't have to accept this bid. I did it just to help you with some advice.
Have a nice day!