Amazon access permissions are set by the user who creates the object. By default, when encoding.com sends a encoded file to a user's Amazon S3 bucket it sets the permissions of this file to 'authenticated-read'.
If you want your file to be public-readable, add ?acl=public-read to your destination URL, like this:
http://your.bucket.s3.amazonaws.com/fooder/file.ext?acl=public-read
This will allow you to share your file with all web users - the file is accessible via this URL: http://your.bucket.s3.amazonaws.com/fooder/file.ext.
If otherwise, you don't want to share your file with anybody, you can make encoding.com to save your file using your OWN Amazon credentials. In this case you have to specify your AWS key and secret in your destination URL:
http://AWS_KEY:AWS_SECRET@your.bucket.s3.amazonaws.com/fooder/file.ext
The file is now accessible only by yourself.
If you want OWN the destination file and grant permissions for it, specify both AWS credentials and ACLs:
http://AWS_KEY:AWS_SECRET@your.bucket.s3.amazonaws.com/fooder/file.ext?acl=authenticated-read