System and method for transcoding encrypted multimedia messages transmitted between two devices

作者: Goran Selander , Frank Hartung

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摘要: A system, method and transcoding proxy are described herein that capable of encrypted content, like an multimedia message or a containing elements parts, which is transmitted between two devices (e.g., mobile phones). Basically, the receives from first device phone). The then requests rights object (TRO) issuer includes content encryption key (CEK) permission (optional). After receiving TRO message, able to (1) decrypt (2) transcode decrypted so it matches capabilities second could be accessed by user phone) (3) re-encrypt transcoded message. sends re-encrypted device.

参考文章(2)
Richard Scott Schwerdtfeger, John C. Hartley, Rabindranath Dutta, System and method for accessibility content copyright permission ,(2002)
Chung-Sheng Li, Richard Yeh-whei Han, John R. Smith, Yuan-Chi Chang, Method and apparatus for networked information dissemination through secure transcoding ,(2001)