So If you are Z, how do you know X was infringed. When some Xs say its ok to download.

How is a person to know.

If I use a mp3 player that has digital music content protection, Should I assume if it plays it is ok.

Let me put it a differnt way. Closer to home.

I am a parent, my child 11 want to down load mp3 files, I do not want to not my child to infring on copy rights of others. My problem is I have no method to determin if a given mp3 file is ok to download or not.

How do I explain Its leagel to here a song played on the radio station. Its leagle to tape that song off the air and play it at some other time. But its not ok if I get the same song off the internect and play it.