How much non-salary income do computer science professors make in the United States? I have seen several questions pertaining to the salaries of professors in the United States. Is there any research/study/survey/... that looked at the non-salary income computer science academics (professors, research scientists, …)  make in the United States? 

By non-salary income I mean any income that doesn't come from the salary. Examples of income source: teaching outside the university, cash from awards, running a side start-up/business, consulting, sitting on boards of directors, giving talks, book royalties, patent royalties. Ideally, the non-salary income should be broken down by the income source.
No, there has been no survey of CS professors' non-salary incomes. We can't prove a negative, but you and I both, and presumably others here, have tried to look it up and found nothing. The likeliest reason is that the research has not yet been done.

Despite the highly upvoted comment about the information being useless, if anyone reading this is interested in performing the income study, I will volunteer to be one of the datapoints.