Sure this Theme is made in Artiesteer 0.o" even if you just used Artiester a few times you notice at once it was made with it.
And yes when you buy artiesteer 2 you can sell your webtheme under the contidtions they have, which is for example you mustn´t put any of the images with people,buildings or the objects you can put from the programm itself into the header or for example the spectacel.png which is (as far i know) also the only real restriction.
For free you could even give out the Themes if you didn´t bought it
but i don´t think anyone whould take the time to put all trial watermarks out