On 2/5/2009, the original rules were reorganized and the rules of "Talents from All Over the World" were integrated. Thanks for that!
On 2/6/2009, several new rules were added.
On 2/10/2009, some rules that were prone to false positives were modified.
On 3/13/2009, some rules that were prone to false positives were modified.
On 3/14/2009, some rules that were prone to false positives were modified, and some rules were added or revised.
On 3/27/2009, defense rules against recent high-risk viruses were added.
On 5/14/2009, the rules were reorganized and some false positives were corrected.