Originally Posted by pilotbob
Is this code in question released under the full GPL or the lesser GPL?
I just had a quick look through "strings boordr", and it looks like the binary includes mupdf and the mad mp3 decoder, both GPL-licensed. A number of other (non-GPL) open source libraries are used without credit - I haven't checked the license terms on those though.
Of course it's possible that Bookeen has paid for a commercial license for some of this software - maybe someone could ask the original authors.