OffensiveContentFilter (item processing stage) reference
Published: May 12, 2010
The Microsoft FAST Search Server 2010 for SharePoint offensive content filtering is implemented as a separate item processing stage. Item content that is run through the filter is compared to predefined terms in dictionaries. The output of the filter is an overall score that indicates the likeliness that an item is pornographic. The item's offensive score is written to the crawled property OCF::Score. Any item that exceeds the score threshold of 30 will be dropped from indexing.
For more information, see Offensive Content Filtering on MSDN.