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early-round honors decision
It is my understanding that "early decision" obligates a student to that institution. This obligation includes the financial obligation. The financial obligation which a student is committing to is NOT contingent upon financial assistance, scholarships, etc. The early decision agreement is a contract to pay (in full, or without regard to a possible financial aid package).

Based on that understanding, the parental permission letter may be required as I believe minors cannot be held to enforcement of a legally signed contract. Something like that.

That's a quick response. Hopefully others will illuminate this further.