GNU/LGNU Licences...

ok, so i tried reading the GNU/LGNU and got totally lost by all it all...

i get confused with end user agreeements and such... so sorry if this is a really dumb question...

but im wondering, i have 2 icon sets, one released under GNU, the other one realesed under the LGNU licence. my question is this... and this is what i gather from what i kinda understood...

Can i use these icons in a software application that im developing, as long as i mention that i A) did not create the icons, and B) link to the source of those icons.

the only reason im asking is its for Paid-Software...so i just want to know what i can or cant do...

Thanks, Justin