It doesn't violate any laws of physics if you are expending power from
photovoltaics to propel your spacecraft.
For example, you could push against the Earth's magnetic field to get a
satellite into a higher orbit.
This article seems to confirm this model, although they don't know what
they are pushing against:
http://www.wired.co.uk/news/archive/2014-07/31/nasa-validates-impossible-space-drive
I agree that this is probably nonsense, but maybe it isn't.
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