The bill, SB1306, takes effect Jan. 1, reflecting the legality of same-sex marriage after a decade of litigation. Brown announced the signing Monday.
The law also removes limits on recognizing same-sex marriages performed out of state and replaces family code references to husband and wife with the word spouse.
The language was enacted after voters approved Proposition 22 in 2000. The initiative was struck down by the California Supreme Court in 2008, prompting voters to amend the constitution and ban gay marriage.
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