Since, unlike copyright law or patent law, trademark law is the one that does require plaintiffs to actively defend their mark or risk losing protection, there'

Since, unlike copyright law or patent law, trademark law is the one that does require plaintiffs to actively defend their mark or risk losing protection, there's always a bit of a gray area where two marks may not look terribly similar, but one can reasonably justify taking action. This instance, however, falls far outside that area.