DVDplus

This has generally been achieved by using certified DualDisc plants that are also licensed to make DVDplus discs.

Although theoretically almost identical, DVDplus discs have so far appeared in practice - despite claims to the contrary - to measure as having slightly thicker CD-compatible layers than DualDiscs (though not sufficiently thick to make them conform to CD Red Book specifications).

This also meant that there were no limitations to the CD-compatible side's playing time as was the case with early DualDiscs.

Despite these factors, return rates for both of the dual-sided disc products as a result of either sticking or non-playability are claimed to be extremely small.

The only European patents granted for the DVDPlus concept have either been withdrawn, revoked or allowed to lapse.