NBC Universal is siding with media conglomerate Viacom in a piracy lawsuit against Google’s YouTube video sharing site.

In a filing Friday, NBC Universal and Viacom submitted a friend of the court brief opposing YouTube’s bid to dismiss the copyright infringement suit brought by Robert Tur, a LA News Service operator. Tur sued YouTube in July for letting its users publish his well-known footage of trucker Reginald Denny being beaten during the 1992 Los Angeles riots.

While NBC is not suing YouTube directly, the court papers state its position on unauthorized video sharing:

“Many of NBCU’s most valuable copyrighted works have been copied, performed, and disseminated without authorization by YouTube and other similarly operated Websites. NBCU has a strong interest in preserving the strength and viability of all of its legal rights and remedies in response to such conduct.”

In related news on Friday, The Premier League, a UK soccer association, and Bourne, an indie music publisher, announced a new class-action lawsuit against YouTube and Google.