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The companies that hold the specific patents 

CyberLink Corporation
Dell Inc.
Hewlett-Packard Company
Hitachi Ltd.
Koninklijke Philips Electronics N.V.
LG Electronics Inc.
Matsushita Electric Industrial Co., Ltd. (Panasonic)
Mitsubishi Electric Corporation
Pioneer Corporation
Samsung Electronics Co., Ltd.
Sanyo Electric Co., Ltd.
Sharp Corporation
Sony Corporation
TDK Corporation
Victor Company of Japan, Ltd.
Warner Home Video Inc.

Wagram said:

Sony doesn't OWN all of blu-ray but rather a share of it. I think Panasonic owns the largest portion of it.

And yes, Wagram is correct. Panasonic owns the most patents for it 



Sig thanks to Saber! :D