The Polynesian, The Grand Floridian, The Contemporary and Bay Lake Resorts now have "Room Occupied" signs in place of "Do Not Disturb."
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According to Disney World, that change gives employees the right to enter any guest room for maintenance, safety or security reasons.
Guests have had mixed reactions.
"Well I do think it's an invasion of privacy, but I do understand," a mom from Chicago said.
"I am for it, definitely, we want everyone to be safe," Rosa Crespo, from New York, said.
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This comes months after the worst mass shooting in modern U.S. history in which a gunman shot people at a music festival of a Las Vegas hotel.
Disney declined to say whether the change was made because of the Las Vegas massacre.
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