I cannot convert certain mp3 files because of copyright restrictions. Why is this?

It is not possible to download and convert certain files because of YouTube’s copyright restrictions

I order to convert a file to mp3 format, Youtube2mp3.net first has to retrieve the video directly from the YouTube site.

In certain cases, YouTube can prohibit the viewing and, therefore, the downloading of videos in a country.

The moment that Youtube2mp3.net attempts to download a video with copyright restrictions, YouTube blocks the download providing information on the restrictions concerned.

In this case, therefore, it is impossible to convert the video to mp3 format.