Microsoft CEO Steve Ballmer accused Google of not being able to make up its mind.
Plain thievery," Murdoch wrote in a series of tweets, which also accused Google of facilitating piracy.
The company is accusing Google of allowing people to view Perfect 10's copyrighted images from third-party websites that are shown through Google's image search.
Mr. Toback dropped a federal lawsuit last month that accused Google of profiting from child pornography.
A lawsuit in 2005 also accused Google of hiding its click-fraud numbers from the public - thus, perhaps, the increasing attempts at transparency.
On both counts the authors and publishers accused Google of blatant copyright infringement.
The announcement comes shortly after Viacom accused Google of not making enough effort to keep its content off of YouTube.
Human rights groups have accused Google of helping the Chinese Government in repressing its citizens and particularly human rights activists.
The proposed settlement arose from a series of lawsuits that accused Google of violating copyrights via its book-scanning agreements with various libraries.
In December 2006, the company accused Google of unfairly competing against its own customers by bidding on keywords that Google held an interest in.