content_image/974090.jpg content_image/974091.jpg
After the task completes successfully, the GUI shows that encryption is licensed for the specified node, as shown in Figure 7-23. 

<img src='content_image/974090.jpg'>

## Problems with manual license activation 

Although authorization codes and encryption license keys use the same format (four groups of four hexadecimal digits), you can only use each of them in the appropriate activation process. If you use an authorization code when the system expects a license key, the system displays an error message, as shown in Figure 7-24. 

## 7.4.3 Enabling Encryption 

<img src='content_image/974091.jpg'>

This section describes the process to create and store system master access key copies, also referred to as encryption keys . These keys can be stored on any or both of two key providers: USB flash drives or a key server. 

Support for simultaneous use of both USB flash drives and a key server is available in IBM Spectrum Virtualize code V8.1 and later. Organizations that use encryption key management servers might consider parallel use of USB flash drives as a backup solution. During normal operation, such drives can be disconnected and stored in a secure location. However, during a catastrophic loss of encryption servers, the USB drives can still be used to unlock the encrypted storage. 

The following list of key server and USB flash drive characteristics might help you to choose the type of encryption key provider that you want to use. 

