Indiana Code Title 34. Civil Law and Procedure § 34-37-1-1

Sec. 1. (a) There is no difference in evidence between sealed and unsealed writings.  Every writing that is not sealed has the same force and effect that it would have if sealed.

(b) A writing under seal, except conveyances of real estate or any interest in real estate, may be changed or altogether discharged by a writing not under seal.

(c) An agreement in writing, without a seal, for the compromise or settlement of a debt, is as obligatory as if a seal were affixed.