Mathmonster

Please can anyone who is aware share with me.. I'm curious to know if the developers of applications like ''you tube downloader'' do they have any agreements or relationship with youtube .. or een I can just make my own you tube downloader without contacting the firm..!!

Ur answer is very important for me.

Khalspi

This may be too late but from what I've seen many of these software simply grab the video while it is being streamed.

This method doesn't require any specific agreement since the software is perceived as someone watching the video. In fact, many of these software have to continuously update in order to keep up with YouTube's changes, often being useless for days before a patch is out. This doesn't seem like something YouTube would do to its partners.

I cannot advise you about creating your own software to do this.