I wonder about this issue, too. I am in the process of modifying my gadget for my first release and I have had help from all over. I have improvised on at least 3 scripts from tutorials and widgets (I did do alot of the script myself, though). The graphics are all mine.
If I release a widget that anyone can open in DX Builder and look at the script I would expect that it would get used. So, if I release that widget for public use it'd be nice to get some credit but I wouldn't expect anyone to ask me for permission. That's just me though.
