We're working with a similar thing. Don't much care for the 'sentient hologram' idea -- but the program behind the hologram, yes. In our 'verse, the ship recently rescued 'people' from a supernova; to stay alive (they didn;t know of other lifeforms out there), they had encoded themselves by destructive uploading into computer software that mimiced the person. these programs, the questions is, are they alive or not, sentient or not?
They've been taken back to the Galor Daystrom Annex where they are living in a computer-based reality, but can interface with the real world through the holodeck. The questions: what are their rights or do they even have them? What laws should govern their actions?
"War is an ugly thing but not the ugliest of things; the decayed and degraded state of moral and patriotic feelings which thinks that nothing is worth war is much worse. A man who has nothing for which he is willing to fight, nothing which is more important than his own personal safety, is a miserable creature and has no chance of being free unless made and kept so by the exertions of better men than himself."
John Stuart Mill