Search Engine Forums, SEO Forum

Hi,
Does anyone have a clue what is the approximate duplicate contect filter algorithm that google uses ?
How original - indexed content can be duplicated and in the same time be included in the google index?

No one knows this except some google engineers. However, you may want to look at their patents. It's not as simple as a percentage.

Here is Google's patent on duplicate content.

One way duplicate content is detected is by comparing the links on a page. This is a way AltaVista patented a while back.

Here is the AltaVista Patent