1.Is it illegal to embed youtube videos on my personal website? can i embed and kindss of video from youtube without loosing my adsense account??? Any answer ... 2.Is it illegal to copy videos from youtube and/or other similar websites and use them in my personal website?
1. No. Adsense actual offers youtube videos for promotion 2. Yes/No. Considering the content isn't yours, you cannot outright copy it. You would have to contact that member for their permission.
If you read YouTubes agreement pages you probably are legally allowed to embed videos Copying YouTube videos would most likely be in breach of copyright laws locally where you are, and possibly computer misuse laws.