Does ITunes Store content encrypted??

It does not encrypt them, but does change the file names, and stores the files in random folders. It then uses a database to untangle this mess.

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So, as I understood if I buy one song, then I can give all my friends. Does it a bug of Apple DRM??
You didn't understand, and the original replyer was wrong anyhow.

DRM protected iTunes files are within an encrypted container. iTunes, Quicktime, and thanks to the wonders of reverse engineering, Real Player can decrypt this container to play them back if that computer has been authorised. Only 5 computers at once can be authorised.

The DRM free files are not enclosed in any sort of encypted container and may technically be shared freely with your friends (although obviously a copyright violation). However, your account information is embedded within the music unless you strip it out, and if your friends put it on their Limewire or whatever share folder, you'd potentially be found out.

So, how I can to protect my Podcast from editing on PC?? I want in order to users see my Podcasts only on IPod or ITunes without editing my content. It is very important!You don't, it's that simple. The only DRM that works with iTunes is Apple's Fairplay, and the only people who get to add Fairplay DRM to anything is Apple. So unless you can strike up a deal with Apple for them to sell your podcast (which they don't), it won't be protected.

I'm also not at all clear where this went from, "I'd like to buy a song and share it with my friends", to, "I'd like to prevent people from editing my podcast", but that's a whole other matter.

...You can't create video using the iPod video.

I'm guessing English isn't your first language, and to be quite honest, I have *no* idea what it is you're trying to ask.

Have you tried googline for a forum on iPods that's in your native tongue?