Biggie was sued for copyright because of the samples used on the album.
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15 Things You Need To Know About Notorious B.I.G's 'Ready To Die'

7. Biggie was sued for copyright because of the samples used on the album.
A jury decided that Biggie and Puff illegally used samples in 'Ready To Die', 'Machine Gun Funk' and 'Gimme The Loot.' They were made to pay $2.8 millions in damages because of it.