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Unlike images, ebooks do not appear to have a specific metadata 'slot' for "Creation Tool", in images you'll see things like Adobe Photoshop, Corel Paintshop etc.
If you want to remove the <dc:contributor opf:role="bkp"> entry you can do it with the Sigil Metadata Editor, its in the Tools menu, you can also add roles - eg translator, illustrator etc.
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