That's crippled in my book.
Apparently, the DVD consortium, in an attempt to avoid the CD burner debacle, specified that only the single-layer burners would be released to the average consumer - in order to guarantee that "we the peepul" would not be able to copy Hollywood releases.
"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche