From the BJCP Style Guidelines:
Overall Impression: A dark, strong, malty lager beer.
ABV: 6.3 - 7.2%
Now compare that to this keg label:
You read that right: this so-called "Bock" contains "no more than 3.2% alcohol by weight". Granted, that's 4% by volume, but it's still less than ⅔ of the minimum spec.
I ran across another Amber Bock keg that was not so labelled, and I've learned that the standard-strength brew is 5.2% ABV; not quite as laughable, but still significantly light.
So much for truth-in-labelling.
(And while I'm at it, it's not really "amber", either.)