The Recording Industry Association of Japan (or 'RIAJ' for short), has just released the digital recording sales certifications that artists achieved during the month of December.

To announce the certifications, the RIAJ works together with almost all of the digital and mobile download portals in Japan, including recochoku, dwango, music.jp, mu-mo (Avex), oricon ME, and many more. After compiling the data from all the major download portals, the RIAJ then releases the new certifications on the 20th of every month.

For the RIAJ, the thresholds for digital (online and mobile) certifications are as follows:
Gold - 100,000 downloads, Platinum - 250,000 downloads, Double Platinum 500,000 downloads, Triple Platinum 750,000 downloads, and Million - 1,000,000+ downloads.

The December certifications are as follows:

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< Japanese Chaku-Uta >

# Double Platinum

"Love Story" - Amuro Namie : 2011/11/02

"Flying Get" - AKB48 : 2011/08/03

"MR.TAXI" - Shoujo Jidai (SNSD) : 2011/04/13

*Chaku-Uta only has certifications for Double Platinum, Triple Platinum, and Million!

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< Japanese Chaku-Uta Full >

# Million

"Heavy Rotation" - AKB48 : 2010/08/04

# Double Platinum

"Tsutaetai Koto ga Konna Aru no ni" - INFINITY 16 welcomez Wakadanna from Shonan no Kaze & JAY'ED : 2009/08/19

"Hyakuman-kai no 'I Love You'" - Rake : 2011/03/02

# Platinum

"Love Story" - Amuro Namie : 2011/12/07

"Yasashiku Naritai" - Saito Kazuyoshi : 2011/10/21

"Tatoe Donna ni..." - Nishino Kana : 2011/11/02

# Gold

"Happiness" - AI : 2011/11/18

"Sit! Stay! Wait! Down!" - Amuro Namie : 2011/11/30

"Kiss" - Crystal Kay : 2005/02/23

"Koibumi ~Love Letter~" - GReeeeN : 2011/11/02

"Ningyo Hime" - Koda Kumi : 2006/07/26

"LOVE SONG" - Sandaime J Soul Brothers : 2011/05/04

"Anata no Uta" - Sonar Pocket : 2010/06/16

"Bo Peep Bo Peep (Japanese ver.)" - T-ARA : 2011/09/28

"progress" - Hamasaki Ayumi : 2011/08/31

"U&I" - HO-KAGO TEA TIME : 2010/09/08

"EXIT" - Porno Graffitti : 2011/02/23

"Hamaguri Bomber" - Yazima Beauty Salon : 2009/07/08

"GOOD LUCK MY WAY" - L'Arc?en?Ciel : 2011/06/22

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< Non-Japanese Chaku-Uta Full >

# Platinum

"Baby I Love U (English Ver.)" - CheNelle : 2011/06/22

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< Japanese Digital (PC) Singles >

# Platinum

"Everyday Kachuusha" - AKB48 : 2011/05/25

"Flying Get" - AKB48 : 2011/08/24

"Yasashiku Naritai" - Saito Kazuyoshi : 2011/11/02

# Gold

"Happiness" - AI : 2011/11/23

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Source: RIAJ