Sansa Clip Zip and DRM

Hello folks!

Is it possible to copy and play DRM-protected WMA files on a rockboxed Sansa 
Clip Zip? The files are in DRM 10.0 standard.
I'd love to listen to audiobooks in this format offered by my local library 
but I experience problems trying to copy the audiobbok onto my player.
On the PC the audiobook plays correctly in Windows Media Player, I 
successfully obtained the licence to play this audiobbok within the 
following 14 days and it's possible to copy it onto an mp3 player using 
Windows Media Player, given the player supports DRM-protected files and MTP 
USB modus.
Sansa Clip Zip supports both. I don't know how to chnge into the MTP modus 
under Rockbox so I booted the original firmware, switched the USB modus into 
MTP and connected the player with my PC.
It appears correctly in Windows Media Player but whenever I try to synch the 
selected Synch Playlist with the player, nothing happens.
Am I doing something wrong? How can I get the audiobook to copy and play on 
my Sansa Clip Zip?
And one more question: how can I switch into the MTP USB modus under 
Rockbox? I only found an option to hide the USB drive but it's not what I'm 
looking for.
I really hope some of you here will be able to help me as I can't use any 
other player i.e. without Rockbox due to my almost non-existing sight where 
Rockbox is simply a huge help for me and a necessery enhancement!
Kind regards,

Barbara 

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