If the product you're using is a copyright infringement, regardless of whether or not you, yourself, receive payment, you could still be held liable.  HOWEVER, that would only be if the original copyright holder brings a lawsuit against you.  I haven't heard of it happening yet, but, I'd hate to be the one they set the precedent against, you know?  Why use a product declared to be a copyright violation when there are thousands that aren't?

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Knowledge is knowing a tomato is a fruit. Wisdom is not putting it into a fruit salad.