The people behind this service should beware of copyright violations - just because a video has been made accessible to the general public by their authors does

The people behind this service should beware of copyright violations - just because a video has been made accessible to the general public by their authors does not necessarily mean that others have the right to translate the contents of that video. I remember that a co-worker of mine started translating his favorite math book into his native language, at first just for his private use. But then he thought that others might benefit from his effort, too, so he contacted the publisher of the original book. He was only half-way through with the translations and had kept everything to himself, but the publisher was not amused at all and fired back at him in classic cease-and-desist manner. He stopped translating right away. Such an attitude sucks, but from a business perspective I can sort of understand that the copyright holders want to keep the option to offer a translated version themselves. And in that case, it's certainly their right to pick the (certified) translator of their choice. I don't know if the above scenario translates (no pun intended) very well to web videos, especially those that are made available without commercial interest by their authors. But the question of copyrights is ever so present these days.