Indiana Code Title 36. Local Government § 36-2-17-4

Sec. 4. (a) A county officer may record documents by miniature photographic process or microfilm process if:

The officer shall index and file the original copy in a suitable container in the office where the document is recorded, in such a manner that it is easily accessible and readable by an interested person.  The officer shall preserve the duplicate copy in a fireproof vault, either in the courthouse where the office is located or in a place designated by the county executive.

(b) When recording a release, assignment, or other document that requires a marginal entry or notation on a prior record made under this section, an officer acting under this section shall:

(c) An officer recording a document under this section has exclusive control over the film and records in the officer's office, and the officer may not return an original document to the person presenting it for record until the film copy of that document is properly recorded, indexed, filed, and made available to interested persons.