Prodisc confirmed it received notification of license revocation from Philips late last month. Since the revocation of patent licenses is expected to prevent exports of CD-R discs to Europe and the US, CMC, Ritek, Prodisc and Lead Data all indicated they will soon meet to discuss how to handle the situation.
This only affects CD-R based discs, and doesn't have any impact on DVD media. Other companies still have valid patents through Philips, and the specific reasoning behind all the revoking isn't made clear. Because of the popularity of CD-R media, these companies won't waste any time in getting back in each others good graces.