Short answers, pulled from the story.
Martin Luther King Jr. delivered the speech on the 28th of August 1963, from the steps of the Lincoln Memorial in Washington, D.C., during the March on Washington for Jobs and Freedom. More than 250,000 people were in attendance.
No. King departed from his prepared text to deliver the famous "I have a dream" peroration improvisationally. Gospel singer Mahalia Jackson, seated behind him on the podium, called out "Tell 'em about the dream, Martin!" just before he began that segment. King later said he reached for the first run of oratory that came to him.
George Raveling, a security volunteer and Villanova Wildcats basketball player who was on the podium with King, asked for the original typewritten manuscript as King finished speaking. King gave it to him. In 2021, Raveling transferred custody to Villanova University, and the document is on rotational display at the National Museum of African American History and Culture in Washington, D.C.
Two days after the speech, COINTELPRO head William C. Sullivan wrote an internal memo identifying King as the most dangerous figure in the civil rights movement. The FBI expanded its COINTELPRO operation against King's Southern Christian Leadership Conference directly in response to the speech's impact.
Yes. King had been using the phrase since at least 1962. A speech containing the "I have a dream" refrain was recorded on the 27th of November 1962, at Booker T. Washington High School in Rocky Mount, North Carolina, and was longer than the Lincoln Memorial address. He also used the refrain before 25,000 people at Detroit's Cobo Hall on the 23rd of June 1963.
The King estate was confirmed to hold copyright over the speech through the 1999 court case Estate of Martin Luther King, Jr., Inc. v. CBS, Inc. Under applicable law, the speech will remain under copyright in the United States until 2038, which is 70 years after King's death.