[EricH]

Officially, I don't remember seeing any limitations. However, companies would need to think through the implications of sponsoring various groups--to take the alcoholic drink example, if I'm a company that sells those, I don't necessarily want to have my name/logo all over a high school competition, because I could be seen as promoting underage drinking. So if I DO sponsor such a competition/team, I'm going to either do it through a proxy that most people won't recognize as being part of the company (or as a personal thing) or ask them for complete secrecy on everything except paperwork that is absolutely required (say, team financials). Which kind of defeats some of the point of sponsorship...