Pop superstar Prince's record company is battling a woman who posted a video of her child dancing to one of his songs on YouTube.
Stephanie Lenz uploaded the 29-second clip in February 2007, but it was pulled down after Universal Music Publishing claimed the recording of Let's Go Crazy infringed copyright.
Lenz won an appeal to have the video reinstated and is now fighting Universal to keep it online.
Her supporters claim the film qualifies for the "fair use" defence, as it was created for friends and family.
A U.S. judge has already refused Universal's attempts to have the video pulled and the case dismissed, because Lenz has incurred costs.
Lenz says she is determined to see the case through to completion.