I think Donna partly owns the Chorus Line copyright.
She's the widow of Michael Bennett, the show's creator.
She's not actually his widow since they divorced. DM wrote in her biography that he wasn't speaking to her at the time and showed some hostility toward her, and that she essentially signed away her rights in the settlement, which consisted of an apartment, "a nominal monetary settlement and a limited monthly stipend," and a $20,000 insurance payout.
A net search brings up a list of Bennett's heirs: his brother, his lawyer, a friend,
ACL's set designer, and a foundation for AIDS research.
McKechnie and the others received a proportion of the take from the original production and some royalties (the musical was based on taped sessions with them), but the original agreement was limited to that.
