I think you can use "E.M. Free DVD Copy". It is an easy, effective and handy DVD movie backup software.

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None of these tutorials work, neither DVDs nor youtube lessons. It takes many years of offline lessons to learn how to sing. You can't afford lessons but this doesn't mean that you should damage your voice, that's usually the result of DVDs or youtube. In case of voice damage you will have to pay lots of money to doctors and that can be even more expensive that those courses.

If you can't afford lessons try joining a choir. It's not the same with having lessons but it's a good way to learn a few things. Or find a new hobby until you can afford to sing safely.