  A measurement is presented of the ZZ production cross section in the ZZ to 2l
2l' decay mode with l = e, mu and l' = e, mu, tau in proton-proton collisions
at sqrt(s) = 7 TeV with the CMS experiment at the LHC. Results are based on
data corresponding to an integrated luminosity of 5.0 inverse femtobarns. The
measured cross section sigma(pp to ZZ) = 6.24 [+0.86/-0.80] (stat.)
[+0.41/-0.32] (syst.) +/- 0.14 (lumi.) pb is consistent with the standard model
predictions. The following limits on ZZZ and ZZ gamma anomalous trilinear gauge
couplings are set at 95% confidence level: -0.011 < f[4;Z] < 0.012, -0.012 <
f[5;Z] < 0.012, -0.013 < f[4;gamma] < 0.015, and -0.014 < f[5,gamma] < 0.014.
