3. Accessing the edX Data Package# This section describes in detail how to access the edX data package. It includes the following sections. 3.1. Keys and Credentials for Data Transfers 3.1.1. Overview of Key Setup and Exchange 3.1.2. Data Czar: Create Keys for Encryption and Decryption 3.1.3. EdX: Deliver Credentials for Accessing Data Storage 3.1.4. Decrypt an Encrypted File 3.1.5. Use your Credentials to Access Amazon S3 3.2. Downloading the Data Package from Amazon S3