Using a copyright work and modifying it in some way often qualifies for fair use. I also think that in your example the antivirus companies would be happy to se

Using a copyright work and modifying it in some way often qualifies for fair use. I also think that in your example the antivirus companies would be happy to see who complains about their copyright violation. http://copyright.gov/fair-use/ http://copyright.gov/fair-use/