When is it okay to burn CDs?
Generally, there’s no legal right to digitally copy and distribute copies of copyright protected material.
Burning a purchased copy of a DVD/CD onto your own digital device will not raise concerns as long as:
The copy is made from an authorized original DVD/CD that you own.
The copy is for your personal use. It’s not personal use to give away or lend the copy to others for copying. That is illegal.