prevent right-copy

Dear All, all of my photos in some of the posts that do not have sliding gallery seem to have ‘copyrights’ protected, as I cannot drag-drop photo or right-click to copy the photo. However, the ones within the sliding gallery seems to not have that protection.

Can anyone please tell me how to fix this? I would like all my photos to be protected.

Thanks so much!!!
p.s. I have autofocus+ pro