It is important to note that copyright law and trademark law, while both considered "intellectual property", differ quite a bit. Copyright was originally enacted to "promote the progress", while trademark law is intended to protect consumers (to be brief). Further, trademarks are enforced as long as the owner of the mark continues to defend it, while copyrights last _only_ 70 years after the death of the author.
EDIT: Grammar, and to add that what I've written is only the tip of the iceberg as to how these concepts differ in law.
EDIT: Grammar, and to add that what I've written is only the tip of the iceberg as to how these concepts differ in law.