AONT = All Or Nothing Transforms = a secure way to transmit a document to a recipient in such a way that the recipient either gets the entire unmolested document in originally submitted form, or nothing at all. This idea goes back to Ronald Rivest of MIT. Very clever idea. It is crypto without being crypto in a legal sense.
See also https://github.com/dbmcclain/Math, https://github.com/dbmcclain/LispPlotter, https://github.com/dbmcclain/EBU-R128 and probably more.