This challenge is being help by The Blue Stocking Society and in it were learn how to identify what edition our book is! Now I am much too sleepy to be sure, but I think, based on the info on the challenge page, that my book is a first edition ebook.
I am reading Son of the Shadows by Juliet Marillier. Here is a picture of the copy rights page, if I am wrong, please correct me. I will be going back and reading about this stuff more when my mind is once again functioning.