The ACLU and three other plaintiffs have filed a lawsuit against the Washington Metropolitan Area Transit Authority, alleging its advertising guidelines are unconstitutional. Pablo Martinez Monsivais/AP hide caption

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Pablo Martinez Monsivais/AP

A macaque took this self-portrait in 2011 with a camera owned by photographer David Slater. PETA says the monkey owns the copyright; Slater says he does. The U.S. Copyright Office says no one can, and a federal judge has now said it would be up to Congress to extend copyright privileges to animals. David Slater via Wikimedia Commons hide caption

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David Slater via Wikimedia Commons

During the 2014 Tournament of Roses Parade, SeaWorld's float was accompanied by police in Pasadena, Calif. PETA supporters were arrested for protesting the float that day, and PETA claims that a SeaWorld employee posing as a PETA volunteer tipped police off to the protest. Ringo H.W. Chiu/AP hide caption

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Ringo H.W. Chiu/AP

PETA Says Undercover SeaWorld Employee Posed As Animal Rights Activist

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Killer whales perform in Shamu Stadium at the SeaWorld Orlando theme park in Florida. SeaWorld says it will not appeal a citation that prohibits trainers from performing with the whales. Phelan M. Ebenhack/AP hide caption

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Phelan M. Ebenhack/AP

A promotion for J.R.R. Tolkien's classic, which is now being made into a movie trilogy, at the Frankfurt Book Fair last month. Arne Dedert /EPA /LANDOV hide caption

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Arne Dedert /EPA /LANDOV