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| | Overview of Trademark Law |
 | | Today, federal law provides the main, and by and large the most extensive, source of trademark protection, although state common law actions are still available. |
 | | Once the prerequisites for a dilution claim are satisfied, the owner of a mark can bring an action against any use of that mark that dilutes the distinctive quality of that mark, either through "blurring" or "tarnishment" of that mark; unlike an infringement claim, likelihood of confusion is not necessary. |
 | | Although likelihood of confusion and dilution are the two main trademark-related causes of action, there exist a number of additional state-law causes of action under state unfair competition law: passing off, contributory passing off, reverse passing off, and misappropriation. |
| cyber.law.harvard.edu /metaschool/fisher/domain/tm.htm (3510 words) |
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