I found in many website that providing free ringtones. My question is how we can sure that these free ringtones is not piracy/against copyright law before downloading them ?

I'm sure, if some companies on the website providing free ringtone, they should:
1. make permission to the creator of song.
2. they compose themselves all the ringtones (not stealing from another website)

Im a right? please give me some advices... thanks.