# Invalidation of signature by data update

If a user updates a signed form, the InForm application invalidates the previous signature or signatures and updates the signature listings and each form to indicate that the form or case report book must be signed again.

Data that has been coded and imported to the InForm application has special invalidation considerations. Coded data is often designed to be hidden on a form. If the import of coded data invalidates a signature, it might not be possible to see which item caused the invalidation. Therefore, study designers can specify whether imported data invalidates a signature.

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