Hi, My current bachelor thesis has something to do with greenfoot. It's about teaching algorithms using greenfoot, Am I allowed to use some pictures from contained in the source code as the book cover? Like the greenfoot splash or logo, and the wombat background tile. If this is out of place, please tell me whom to contact as the picture might be copyrighted by another person? I live in europe and we might have a little different copyrighting law, but asking is always the safest way. Thank you.