Kopimism has been recognized as a belief community and not as a religion[1][2] and as such does not give the followers of Kopimism the same umbrella of protection that is provided to mainstream religions in Sweden. More details on this discussion can be found on reddit[3]
[2]http://www.sweden.gov.se/content/1/c6/02/78/31/04636561.pdf (English translation of [1])
[3]http://www.reddit.com/r/worldnews/comments/o2m6d/filesharing...
As for the effectiveness of this movement, I'm skeptical. If the intention is promotion of freedom of information and critique on intellectual property, there are much more effective ways to go about it; and if the intent is humor/satire, there's not much of that either. I'd avoid discussing Scientology here despite the parallels because discussions about "religion" tend to be more verbose and speculative than what is acceptable at HN.