I second what jj2me just said.
On my sansa (I actually use a battery operated 2GB version so I can recharge the device on the road if it runs out), the wma and mp3 files from the library do not expire. I have three on my device that has been there for months. (I don't take too many long trips).
The Libre will play mp3 files. I just borrowed one using overdrive from the public library and loaded it into the SD card. It also remembers the place where you paused it but cannot leave bookmarks. I don't think it will expire either.
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