OzDVD, Olli just explained it in his replies:
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| If you copy with menus, the titles which you haven't selected are replaced with "full length grey" (movie data with only approx 0.2 MBit rate), tom keep the DVD structure integrity. This makes DVDs created with CloneDVD highly compatible. |
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| but you always risk a destroyed DVD structure. It is nearly impossible to check, if there are cross references in the middle of a title. |