Hi
Have you tried removing the read only label from the entire folder that the photos are saved in?
Go to Properties, for the folder, and when you deselect the read only check box and click apply, you should get a option to apply the setting to all folders, sub folders and files.
It may or may not be that from that time on, new photos added to the folder will be labeled read only.
I'm not sure how importing new read only files into the folder will change the settings.
Mike