Multiple keys are distributed to multiple clients. The keys provide access to media content. A group of clients are identified to receive substituted media content during a predetermined time period. Modified keys are generated that identify the substituted media content and the predetermined time period. The modified keys are distributed to the group of clients. The modified keys cause the group of clients to receive the substituted media content during the predetermined time period.
申请公布号
WO2007097852(A3)
申请公布日期
2007.10.25
申请号
WO2007US01615
申请日期
2007.01.20
申请人
MICROSOFT CORPORATION
发明人
CARLE, KEVIN T.;DE HEER, DAVID L.;BAKAR, MAJD;GROSSMAN IV, JOHN H.;GUTHRIE, RICHARD L.