The WMA format is worse than closed source : it's proprietary, meaning that not only is the format not publicly described by microsoft, but you have to pay them money to use the format in any way (and even then you get a restrictive license preventing you from disclosing details about the format, and so on).
Reverse-engineering is then out of the question (illegal in addition to freaking hard).
Politically, if a microsoft employee had the power to give Rockbox a WMA license, it STILL would be impossible to integrate because MS employees can NOT work on free / GPL projects by contract.
Only hope would be to add hooks between iRiver's firmware and Rockbox, to make the original firmware play the files as a "black box". I don't know if that is even possible - I doubt it.
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