On the Philips licensing website we can read that Philips has added a licensing program for Non Standard Multi Session CDs. The website reads; "An increasing number of audio CDs are being published as multi-session discs. he first session of these discs contains audio that can be played back by a consumer CD-Audio player and the second session contains music, video, and/or other data that can be played back by the CD-ROM drive of a PC.", which could refer to copy protected audio CDs that are current on the market, which are not created conform the red book (audio CD) standard.
These new types of multi-session discs differ significantly from the CD discs for which Philips and Sony offer patent licenses (e.g. CD-Audio, CD-ROM, and CD-Extra). The CD Disc Patent License Agreement comprising the essential patents of Philips and Sony defines a.o. the CD-Extra disc, which is also a multi-session disc. The new types of multi-session discs, however, do not conform to the mandatory features of the CD Extra standard as defined in the 'Enhanced Music CD Standard Specifications", such as the mandatory presence of certain directories and files. Hence, these new discs cannot be called CD-Extra discs. Conditions of the new license program
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Source: Philips.com
