It's all coming back to haunt Google and YouTube.
When the Mountain View search engine kingpin gobbled up YouTube, Inc. for $1.65 billion in October last year, the acquisition shook up the dotcom landscape.
It was the most expensive takeover in Google's eight-year history.
At that time, industry pundits were wondering how Google would deal with copyright issues in view of the "freeloading" of videos on YouTube.
Now, entertainment giant Viacom Media is suing both Google and YouTube for $1 billion for illegally using its TV programs.
The BBC News website reported that the lawsuit seeks more than $1 billion in damages and an injunction to prevent copyright infringement.
Last month, Viacom, which owns cable networks MTV and Nickelodeon, told YouTube to remove 100,000 "unauthorised" clips.
Google's copyright nightmare
Viacom Sues Google, YouTube
YouTube removing Viacom TV shows