Ubisoft is "displeased" that a number of unannounced titles have been revealed on the internet, including new titles in the Far Cry and Splinter Cell series.
A 2 gigabyte file had been posted in a location accessible by the public, since removed, containing artwork, logos and screenshots for announced and unannounced titles, including a tech demo for Far Cry 2.
"We are clearly displeased that confidential information from Ubisoft has been distributed on the internet," said a representative for Ubisoft
"The publication of this type of information can only be harmful to the game development process and we will take all steps necessary to prevent this from happening in the future."
"We are still investigating the events that lead to this information leak and at this time have no further comment," said the representative.
This is the second high profile mistake to cause headaches at Ubisoft.
Back in March of this year, a release schedule appeared on a US consumer site revealing release dates for multiple titles, many of which hadn't been announced at the time, while also pointing towards a November release for Sony's PlayStation 3 console.
The full list of titles included in the archive are:
Far Cry 2
Far Cry PSP
Far Cry Wii
Prince of Persia 4
Rainbow 6: Vegas
Splinter Cell Conviction
Star Wars PSP
Shaun White Snowboarding
Teenage Mutant Ninja Turtles
Teenage Mutant Ninja Turtles GBA