I beleive the perjury clause applies to whether you represent who you claim to represent (eg. not saying you are a lawyer for SomeCorp when you are not). As pkinsky said, I think you only have to meet a "good faith standard" that you think the thing you are filing against is actually infringing.
In practice you don't even need to make a "good faith" claim that you actually have a copyright at all -- no company has ever been punished for sending takedown notices for things that are clearly in the public domain.
