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Can't Edit or Move Index Layer Because it is Locked

This question comes up a lot. You have an image that has an index layer instead of a background layer and the pixels are locked. You can't drag the layer onto another image and you can't edit the locked layer.

This is often the case with .gif and .png images that have been saved with a limited color palette to reduce file size. This saves the image in "indexed color" mode.

Changing the image mode to RGB  will fix this, or you can use a selection tool to select the image or part of the image and then copy/paste it into a different document. This will work even if you can't drag the layer over to a different document. When the image is pasted in as a new layer it will be converted to the target documents color mode.