[ubuntu] Need little information regarding rules for Ubuntu wallpaper contest

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http://ubuntuforums.org – A friend of mine who is a nature photographer by hobby is willing to participate in Ubuntu wallpaper contest. He had submitted his entry to the stream. However, the photo contains his watermark in it. He can re-upload the image without watermark if it is selected. Can this be a issue in selection? Does he needs to re-submit the photo without watermark? I've went through the Ubuntu wiki rules for the contest and unable to find any thing related to it. Can somebody please provide the details? Sorry for being dumb on this matter. I always fail to understand these copy right and copy left things. (Hardware)