TheTVDB.com

You understand, though, that your banner wasn't "stolen", right? And that the rule wouldn't have really applied anyway since they're of different formats. Had Imzadi simply resized your exact copy for use in the season area I would have just changed the credit to you. Since you don't want anything to be done about this and since I don't think there was a rules violation in any way, is it ok if we drop this?

are you saying as it's OK to "dupe" a banner and make it a poster, but it's not OK to "dupe" a banner and make another banner?

Correct. One way creates nearly identical duplicates of the same image in the same format while the other would not. I would still prefer that people create their art completely on their own (as Imzadi did), though.