"To win a copy" means to obtain a free or awarded version of something, typically a book, movie, or software, through some form of competition or giveaway. Full definition
Find out who won a copy of their very own here and get ready for this week's giveaway of another new spring title! (craftstylish.com)
Oh I would love to win a copy because just the title of the book is refreshing. (theinspiredroom.net)
If I don't win this copy I may have to look into buying this book on my own, with one year old twins we are rapidly approaching all this issues. (5minutesformom.com)