Not familiar with the rings, but, if it is held on with a pressure sensitive adhesive (tape).... "Bestine" is a good adhesive solvent used is the Crafts and Graphic Arts trades. Kerosene would probably work as well.
WARNING - Neither should affect the acrylic coating on the disk, but I am not sure of the silkscreened labeling/printing (I think that is how the printing is applied). I don't think it will affect the printing but, test on a less than precious CD first.
HTH - Jim
WARNING - Neither should affect the acrylic coating on the disk, but I am not sure of the silkscreened labeling/printing (I think that is how the printing is applied). I don't think it will affect the printing but, test on a less than precious CD first.
HTH - Jim