rights

A few years ago I designed a typeface called Half Cut Gothic and made it available for free at Dafont and FontSpace, but now a marketing firm here in Canada has contacted me regarding "ownership purchase". Considering it has been available for free for so long, how is it possible to change that? If copyright-wise this is even possible, how much do you think would be a fair price? ...Anything else I should be wary of?

They don't seem too concerned about the freeware part. Quote:

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