It may be dumb, but it's not laugh-out-loud crazy. In fact, it's specifically one of the things that the DMCA does. Here's a whole ton of information about the law: http://chillingeffects.org/reverse/faq.cgi
And here's an article from the EFF with a few citations of cases where DMCA article 1201 has been used: https://www.eff.org/es/wp/unintended-consequences-under-dmca