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Samac has commented in another thread on some of the source files being locked
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Not exactly, the entire EBOOK.ZIP firmware update is password protected. They have a load of proprietary applications which are not covered by the GPL but the linux core is released as source as required by the GPL.
It is a bit like how Apple build OS X on top of Darwin. Darwin is open source and it can be installed but unless you are very good it can do almost nothing, it is only there to run the proprietary apps.
The iriver story works in the same way. Their apps on top of a linux interface layer that accesses the hardware.
Anyway that is my guess as I haven't opened up the EBOOK.ZIP to have a look. However the source code is available
here if you would like to look at it. Unfortunately the interesting bits e.g. /rc.elisa, /zImage, /rootfs.cramfs and /flow_copy can legitamately be withheld, though it does sort of deny the spirit of the GPLv2 that they are using.
samac