So youtube doesn't want it copied. However, the same laws that allow VCR copies for private use would apply, which means you could copy your screen and audio output by using a "capture" program like CamStudio for windows, or RecordMyDesktop for Linux.
I'm using FreeRapid Downloader 0.9u3 software to download youtube videos. I have successfully downloaded videos previously.
But now when I try to download videos it shows me an error as below,
Error - No string between "url": "and " was found
I have tried several other video downloaders also. They also didn't allow me to download videos.
Please help me to solve this problem....

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic