What pops into my mind at this hour, for whatever reason, is this:

One thing I sometimes come across on talk.maemo.org (TMO) is questions about porting some proprietary (closed source) program or game to maemo.

Therefor, a brief explanation of architecture (x86 vs arm), binaries/source code, proprietary/Free Open Source Software (FOSS), would possibly be appropriate, in my humble opinion.