They're certainly allowed to ask. Now whether they are likely to enforce the terms in court, and whether the court would side with them, and whether they would

They're certainly allowed to ask. Now whether they are likely to enforce the terms in court, and whether the court would side with them, and whether they would recoup more than the cost of pursuing the claim, well, that's a different matter. [edit] Not to mention the risk of negative PR, and the consequences for their recruitment pipeline. I suspect if you just said "nope" a bunch, they would come back to you and accept a compromise. They're going to get pennies on the dollar if they send the account to collections. If this were me I'd probably start by saying "I'll give you back 33% if you sign a document disclaiming your interest in the remaining 67%" and kick off the negotiation there. IANAL of course, lol, and this kind of thing I'd want to run by a professional. This is just my gut instinct.