I am not sure I follow your comments on the Jamplayer license.
The one here:
https://www.altera.com/download/licensing/lic-jam.html Doesnt seem to meaningfully restrict people at all.
"Altera grants to you a worldwide, nonexclusive, perpetual license (with the right to grant sublicenses, and authorize sublicensees to sublicense further) to use, copy,
prepare derivative works based on, and
distribute the programs and derivative works thereof, ..."
The license terms are contagious to derivatives, but appear only to be that altera disavows liabilty and asks you not to break US export laws.
And I have seen dieravatives available on the web, eg a beaglebone for for Jamplayer at:
https://github.com/richardplunkett/jamplayer-beaglebone