thoughtbot/paperclip — pull request #973 by martinstreicher (2012-07-26 17:38:36+00:00)
Title: Set the proper S3 header for encryption.

Based on the documentation at http://docs.amazonwebservices.com/AmazonS3/latest/dev/UsingServerSideEncryption.html, it appears that the header x-amz-server-side-encryption must be set.