The extra copyright line should be within footer.php.
The best way to deal with the Papercut image at the top is to replace it with your own logo/image. To match the current image, you’ll need to create an image 399 pixels wide by 45 pixels high. Name this new image “logo.png” and upload to the images folder inside the themes/papercut directory.
I hesitate to hide this image via CSS as doing so will break the design slightly and remove the home link that is currently around that image.