Copyright would apply to the actual film, script, perhaps other elements. For the title, I believe this would be a trademark issue. Whether it is enforceable here is beyond my knowledge. I tried a quick search on the status, but didn’t see the info I hoped for in the top several hits.
https://en.wikipedia.org/wiki/TRON_command
I _think_ the TRON franchise was a nod to the TRON command in BASIC, which predated the name.
Obviously they did later enter the music business, which is when Apple Corp (the record label) litigated for a second time.
From OED: "tron" is "used in the names of devices and machines, spec. particle accelerators, as cyclotron (1935), betatron (1941), phantastron (1943), levitron (1960)."