<P> The Doctor submitted a holonovel titled Photons Be Free to a publisher on Earth, detailing the manner in which holograms were sometimes treated by Starfleet . His characters were closely based on Voyager's crew, but exaggerated to appear more intense and vicious, creating fears among the crew their reputations would be ruined . Tom Paris convinced The Doctor to make adjustments without sacrificing his theme . The Doctor lacked legal rights as Federation law did not classify him as a "sentient being". Thus he was forbidden to make any subsequent changes to the holonovel . Captain Janeway's efforts resulted in The Doctor being accorded the status of "artist", (though not a "person"). This permitted him to rewrite the novel . Four months later, it was known throughout the Alpha Quadrant as a very thought - provoking piece of work . Several other EMHs, now relegated to mining duty, experienced the novel . </P> <P> The Doctor's standard greeting was "Please state the nature of the medical emergency" when activated, though later modified to say whatever he chose . He was later given the ability to activate and deactivate himself . </P> <P> The Doctor later acquired a mobile holographic emitter from the 29th century . Although he had previously been confined to Sickbay or the Holodeck, the mobile emitter allowed The Doctor to move about freely, making him ideal for missions where the environment would be harmful or otherwise fatal to the crew . In one notable incident, when an away team was trapped on a radioactive planet, The Doctor was able to infiltrate the people and almost single - handedly rescue the team because, as he pointed out, being a hologram renders him immune to the radiation, stating that "being a hologram does have its advantages ." </P> <P> The Doctor's programming evolved to the point where he fell in love with Seven of Nine, though she did not reciprocate . In an alternate future episode, "Endgame", The Doctor finally adopts a name (see below) and marries a human female named Lana . </P>

Where did the doctor get his mobile emitter