Title is misleading. It's not a petition to repeal the DMCA, it's a petition to revise it. And surprisingly it actually gets the facts right for once: Revising the law to allow circumvention for non-infringing acts would be a pure win. There is no legitimate reason to prohibit circumvention when there is no infringement, all it does is make criminals out of good people.

That still leaves the issue of whether circumvention should be criminal (as opposed to civil) when infringement does occur, and the related question of whether distributing "circumvention tools" should be illegal in itself, but those are things people can reasonably argue about. (I personally think they're both inane, especially given their demonstrable complete lack of effectiveness at their stated purpose.) But I have never heard any legitimate argument whatsoever in favor of prohibiting circumvention when there is no infringement, e.g. to unlock a phone or make fair use of the copyrighted work. So if anyone can supply any reason whatsoever why that should be prohibited then let's hear it, and if not then let's fix it.