Preahacked TiVo seller tipsheet
Is there a place to report violators of the TiVo hack licences, which may illegally be selling hacked TiVos/images/drives?
I think I found one (The also appropriated the "Strongarm" TiVo logo, probably illegal).
Your best bet would be to either post a specific link here (where many of the hack creators are), contact the selling agency (if its a third party, e.g. eBay) and/or contact the hack authors themselves (who are most able to enforce their license agreements).