Perhaps DM did due it DD and found Vivitar to be an ongoing concern. If Vivitar is a sound business in itself, without taking into account its parent, and if Vivitar will continue as a profitable company if it is sold or spun off, (I cannot see it just fading away into the ether) then why would DM stop any IP infringement action against Vivitar?

Would Vivitar itself be bankrupt if BRLC is? My business knowledge says it would not be if spun off or sold. Could be wrong I am sure more knowledgeable  people here can explain it to me.