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In case the product gets popular you are 100% getting a copyright notice from Google, so may as well change it now rather than after the brand is established

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On the other hand there is absolutely no copyright infringement, it's only the result of following material design guidelines.

Material design guidelines do not allow you to use or edit Google's logos

This would be trademark (or possibly trade-dress, or even design-patent) infringement, not copyright per-se.

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