Is some of this illegal?

I kind of discovered YouTube while searching for Kai Tak videos. They are absolutley great. However there are also entire parts/ short parts of TV series on
Youtube and my only question to that is, is it illegal to watch those TV series on youtube

I heard they just dumped 30,000 films because of copy right infringements' so I would not be surprized if they were against the law.
People do what they want offten enough no matter what the law may be.

Most probably they are illegal,onus lies with the owner of the site(now Google)So watch em while you can

There are some great clips on youtube. At the moment I'm unearthing some amazing Snooker footage that I've never seen before. Sadly there are also films uploaded that go beyond public decency and are downright immoral and law breaking. Another example of an unregulated website.