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The notion of U(1) lepton number (which may only be softly broken) is appliedto models of dark matter which interacts with leptons. Previous scotogenicmodels of Majorana or Dirac neutrino mass are shown to be derivable in thisframework without additional symmetries. Only complete renormalizable theoriesare considered. An explicit class of models with $Z_n$ ($n \geq 5$) lepton anddark symmetry for Dirac neutrinos is derived, as well as an example of $Z_3$dark symmetry.

Leptonic Source of Dark Matter and Radiative Majorana or Dirac Neutrino Mass