DigiTimes has reported that Ritek recently received certification from Philips for their 8x DVD+R DL discs. According to the article, they are only the third manufacturer to do so.
Ritek, one of the top two makers of optical discs in Taiwan, on January 24 announced it obtained certification for 8x DVD+R DL (single-sided double-layer) discs from Royal Philips Electronics last week, becoming the only the third company to receive such certification.
Mitsubishi Kagaku Media (MKM, a subsidiary of Mitsubishi Chemical) and Ricoh in Japan are the only other two companies to have received the certification.
I could have sworn that Ritek got their 8x DVD+R DL discs certified back in October but I guess that wasn't the case. If you'd like to read more, the entire article can be found here.