BD+ Protested Disc?

[PeteWhite]

Apologies if this is considered hijacking but it is a BD+ question...

How do you know if a blu-ray disc has BD+ protection? - I've now backed up about 10 BD discs and have not received any warnings about BD+

Cheers,

Pete

[W&B]

All if not most of Fox Studios releases have BD+ protection and there may be another studio that uses it.