Introduction to the Canon 5D Digital SLR - Blue Crane Digital DVDs are molded from glass masters in the same way that movie studios make theirs. The competition's DVDs are individually burned on to DVD-R or DVD+R media the same way you do it at home.
Their DVDs have a far better compatibility rate and lower defect rate than the competition. Blue Crane DVDs are 100% copy-protected; the competition has no capacity for copy protection.