It's kinda like Weird Al. I remember seeing that he needs no permission to parody songs, but he tries to obtain it anyway. I only recall a couple of people being jerks about it -- Coolio was one, I think. It's also like Avenue Q -- they didn't really have to get permission, as it was absolute parody, but they did it anyway.
I still have to wonder about the logic of what has happened to my vids. I have abridged Dinosaurs eps (put up to help with my first ficverse) and the only thing I've had to do is disable comments from Changing Nature Ending because I kept getting spammed by foul-mouthed jerks. Otherwise, no one has said a word. It's not like the vile-but-still-makes-me-laugh Dino Dubbing series, which has been taken off repeatedly due to every other word being swearing.
Meanwhile, I had two half-dubbed Fraggle Rock vids that were clearly labeled parody and it's not like my voice is so much like Red's and Mokey's that no one could tell the difference. They weren't taken down but they were blocked by anyone in the US. Huh? My vids were respectful and clearly about trying to drum up interest in the upcoming movie and they were blocked! Meanwhile, you can have thousands of "killing Elmo" vids and Sesame Street doesn't say a single word. I don't know what crawled up either the Henson's or Lionsgate's buttocks, but I know that Jake Forbes of Return to Labyrinth appreciates fan work so much he posts about it on his blog. He thinks it's cool someone knows his work. Chester A. Bum of Nostalgia Critic fame blasted Family Guy for ripping him off, only to devolve into tears of joy that someone that "cool" listens to him.
From what I hear, Japan doesn't have this issue with fanwork. I watched some video about plagarized anime/manga and they were just shrugging and like, "Well, it's cool you watch/read it". They even have whole sections of conventions devoted to fanwork and if you're really good you might even get hired by "real" publishers.
I have a real problem with fanwork, respectful fanwork, treated like a crime. Some of these properties have withered on the vine and it's people like us who drum up business. How did the FR movie start picking up momentum? Demand. How did a show from the eighties that lots of kids didn't even see because they didn't have premium cable start mattering again? Fan stuff. I noted that Redsonga and a couple of other people had episodes of FR on Youtube. If you noticed, they were only pulled when the DVD's with those eps on it came out ... which tells me this was more of a Lionsgate purge than a Henson one. I can understand and totally respect that, which is why despite all the clamoring for me to put Dinosaurs eps on Youtube, I won't because the full eps are available and my uploads are just tastes to get the gist of the plot anyway. I just get irritated when something that ISN'T just a blatant upload gets blocked/pulled too. The content I dubbed in was MINE. I credited people all over the place. I encouraged the real deal.
*inhales*
Sorry, I'll try to stop ranting now ... *pants to calm down, LOL*