Dvd Duplicator Dual Layer You Know Those Dvd Duplicators?

You know those dvd duplicators? - dvd duplicator dual layer

That's what I mean:
http://www.copystars.com/copystars_dvd_d ...

the type of DVD recorder things
Insert a DVD movie on the top shelf
and a blank DVD in the lower
and creates a copy.

Well, I know that these things, like home videos and things;
but I'd like to rent a DVD at Blockbuster and a copy in one of these?

I mean, it is not legally possible.