Decca (WARNING: NOT FOR RELEASE LABEL USE!!!!!!!!!! A division of Universal Music Operations Limited)

Please refer to: http://logos.wikia.com/wiki/Decca_Records and http://www.discogs.com/viewimages?label=Decca

If you're looking to add a release label rather than a company relationship, you probably mean to add either:
Decca Records ("Decca Records" superimposed on a flattened hexagonal-shaped black logo; previous iterations with just "Decca" within a rectangular box) — mainly, though not exclusively, for contemporary music releases; or
Decca Classics ("Decca" superimposed on a rectangular blue over red box; its sibling label, used for the US market for a time, was "London Classics")— exclusively for classical/operatic releases.
there are other sub-variants in the Decca family of labels (which perhaps are more easily distinguishable), but these are the two most common ones.