Generally speaking, the answer is no. Even if you are unaware of a copyright, it is still not generally appropriate. This is because some images may be protected by other intellectual property rights, such as trademark or trade dress, or may be protected by privacy or publicity rights. Additionally, using an image without permission could lead to legal issues even if the image is not protected by copyright, as the owner of the image may still have the right to control how it is used.
Therefore, it is always a good idea to get permission from the owner of an image before using it, even if you believe the image is not protected by copyright.
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