Define "Adaptation"

Here is the trailer for the new movie, Age of Dragons. 

Within the clip, a tag line reads "Herman Melville's 'Moby Dick' told like never before." I'll say. It should be telling that the title Moby Dick is actually in quotes instead of italicized, as if it's some nebulous idea rather than a published work. 

There may be more to this movie than metal music and rusty harpoons, but consider this - if your sci-fi world is overrun with vicious dragons, a quest to hunt one of them is probably a practical defensive goal. 

However, what makes Moby Dick interesting is that Captain Ahab and his crew elect to go on a fool-hardy quest out of revenge and hubris, rather than out of necessity. As such, it creates a brilliant metaphor of the struggle against fate and unattainable desires.

Maybe I'm missing the point about a movie where people hunt CG dragons with harpoons, but it's probably better to allude to the book, rather than claim "adaptation." That said, Danny Glover does look pretty cool. 

Now to cleanse the pallet. From Moby Dick:

All men live enveloped in whale-lines. All are born with halters round their necks; but it is only when caught in the swift, sudden turn of death, that mortals realize the silent, subtle, ever present perils of life.