DO NOT USE.
Usually the name is found as trademark holder for the noise reduction technology (and it's graphic representation) Dolby.
Do not add this entity to the LCCN.
Instead quote they way they're credited on the releases in the release notes.
Add Dolby (or variations of this as found on releases, e.g. "Dolby B", "Dolby HX Pro" etc.) in the format line via free text field, is there are other releases without "Dolby".