The Wayback Machine - https://web.archive.org/web/20190318221208/https://docs.aws.amazon.com/AmazonS3/latest/dev/CopyingObjctsMPUapi.html
Amazon Simple Storage Service
Developer Guide (API Version 2006-03-01)

Copying Objects Using the Multipart Upload API

The examples in this section show you how to copy objects greater than 5 GB using the multipart upload API. You can copy objects less than 5 GB in a single operation. For more information, see Copying Objects in a Single Operation.