Currently, Tokbox's OpenTok supports archiving to Amazon S3. Amazon S3 supports AES-256 encryption at no additional charge. They recently added the ability to submit a user-generated key to encrypt the files with, but the key must come with the PUT request when adding the file to their service. Can I submit an encryption key to Tokbox/OpenTok to provide to Amazon S3 when archiving?
Tokbox now offers encrypted archiving as a Premium or Enterprise feature: