Sony DRU-810A Operating Instructions Manual page 29

Copy controlled CDs
This product is designed to play back discs conforming to the compact disc
(CD) standard. Audio CDs encoded with copyright protection technology are
now marketed by various record companies. Be aware that some of these discs
do not conform to the CD standard and you may not be able to play them back
with the drive. When using the drive as an audio CD player, only use audio
CDs with the following mark. Some of these discs are encoded in such a way
as to prevent sampling and/or copy, while others can only be played back
under certain conditions. For details, refer to the documentation of your audio
CD.
Attention Regarding DualDisc Software
This product has been engineered to provide the highest entertainment value
while playing standard CD and DVD discs. Using a DualDisc with this product
may scratch or abrade the surface of the video side of the DualDisc and affect
its playability and should not be used with this product.
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