According to the RFB&D web site, WMA format books (AudioAccess) are downloaded using the RFB&D Download Manager, then Windows Media Player sends the files to your Fuze.
WIndows Media Audio can integrate license data (drm) using the Plays For Sure system (WMDRM-10). The PFS system works by a dual-part license system. First, the computer or device is authorized via a license key. Windows Media Player can send the file to your Sansa using MTP Mode , which uses the Secure ID of the portable device. Integrated in each encrypted file is a leaf license, based upon the authorized computer, and the device ID.
In short, files transferred from your computer to the authorized device will play. If the file is transferred to a second device, as in a transfer between devices, the file will not play. The system is designed to inhibit unauthorized copying. Regarding files transferred to the microSD card_,_ the SD part of the name stands for Secure Digital, so protected media can indeed be transferred to the card, as long as the file is transferred to the card while it is mounted in the Sansa. If you transfer the file from the PC directly to the card using a card reader, the WMDRM-10 system cannot access the card in the same way a when it is mounted in an authorized device.
First, use the RFB&D Download Manager to download the file (be sure it is WMA and not DAISY format) to your PC.
After downloading your audiobook, test to see if it will play on the authorized PC, by opening the file in Windows Media Player.
To transfer the file to your Fuze, you must use the Synchronize function from within Windows Media Player. This allows the device to receive the transfer of protected media with the license data. Dragging and dropping the file directly will not transfer the required license data.
To access the Secure iD of your Sansa, the player must be in MTP mode, which is integrated in Windows Media Player 10 and later. To check if your player software is capable, open Windows Media Player, and click on Help > About at the top of the window. If you need to upgrade the player, click on Check For Updates, and install WiMP 10 or later.
The Fuze is normally set to Auto Detect mode, and if MTP is available, it should connect in MTP. You can manually select MTP by going to Settings > USB Mode > select MTP, then plug in the Sansa. In Windows 7, the Device Stage should open as the Fuze is recognized. If you see the device listed as Internal Memory and External Memory, MTP is the active mode.
On earlier platforms, click on My Computer. If the Fuze is in the correct mode, and MTP is active, the fuze will be listed at the bottom of the list, under Other, as a Media Device. If the Fuze is listed as a flash drive, with drive letters assigned to the device, the Fuze is in MSC mode (and protected media cannot successfully be transferred). If this is the case, let me know, and we can troubleshoot this.