The BD+ licensing authority maintains an online list of those who have become adopters, content partners, or eligible code developers for this layer of Blu-ray security. So far, only Fox is a content partner or code developer.
I've been keeping track of changes in the list and a number of companies have become adopters and one company is no longer on the list. Given Toshiba's recent capitulation, it's not not at all surprising that the list is growing. The recent additions are:
China Huala Group Co., Ltd.
Gowell Electronic Limited
Mitsubishi Electric Corporation
Shenzhen MTC Co., Ltd
Twentieth Century Fox Film Corporation
Winbase Electronics Corp., Ltd.
Apparently Tonic Digital Products Limited has been removed from the list.