This is the wording on the purchase page. As I mentioned before, if you're using Houdini alongside another DCC, the income threshold SideFX are interested in only relates to income derived from Houdini itself.
*I confirm that any financial considerations received, directly or > indirectly, from use of the Software is less than $100,000 USD per calendar > year.* They don't police it in any way but if they see your name croping up in the credits of the next Star Wars epic, expect a visit from the SideFX heavies. :)
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