Call of Duty: Black Ops is intellectual property that has a copyright by Activison / Treyarch. Under US (and Norwegian) law, you are granted rights that permit a person to infringe copyrights if by doing so you are criticizing the copyrighted intellectual property.

"Intellectual property (IP) is a term referring to a number of distinct types of creations of the mind for which property rights are recognizedand the corresponding fields of law.[1] Under intellectual property law, owners are granted certain exclusive rights to a variety of intangible assets, such as musical, literary, and artistic works; discoveries and inventions; and words, phrases, symbols, and designs. Common types of intellectual property include copyrights, trademarks, patents, industrial design rights and trade secrets in some jurisdictions."