Prince was also involved in copyright disputes in the 2000s, threatening to sue YouTube and eBay in 2007.
"YouTube ... are clearly able (to) filter porn and pedophile material but appear to choose not to filter out the unauthorized music and film content which is core to their business success," a statement released on his behalf said.
Ever surprising, he announced on stage in New York City last month that he was writing his memoir. "The Beautiful Ones" was expected to be released in the fall of 2017 by publishing house Spiegel & Grau.
The publishing house has not yet commented on status of book, but a press release about the memoir says: "Prince will take readers on an unconventional and poetic journey through his life and creative work." It says the book will include stories about Prince's music and "the family that shaped him and the people, places, and ideas that fired his creative imagination."
In 2004, Prince was inducted into the Rock and Roll of Fame, which hailed him as a musical and social trailblazer.
"He rewrote the rulebook, forging a synthesis of black funk and white rock that served as a blueprint for cutting-edge music in the Eighties," reads the Hall's dedication. "Prince made dance music that rocked and rock music that had a bristling, funky backbone. From the beginning, Prince and his music were androgynous, sly, sexy and provocative."
A small group of fans quickly gathered Thursday outside his music studio, Paisley Park, a white building surrounded by a fence about 20 miles southwest of Minneapolis. A Carver County sheriff's squad car was parking in the studio lot.
As of about 2 p.m. ET "The Very Best of Prince" topped Apple's iTunes album chart — with "Purple Rain" in the third position.