公开(公告)号：EP1073222A3

公开(公告)日：2005-06-08

申请号：EP00306081.1

申请日：2000-07-17

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Norr, William M.

IPC: H04H1/00

CPC classification number: H04H60/23 ,  H04H60/07 ,  H04H2201/183 ,  H04H2201/20 ,  H04K1/00 ,  H04L9/0827 ,  H04L2209/56 ,  H04L2209/80

Abstract: Audio or other information is delivered to a user via a multi-stream digital broadcasting system in a partially-encrypted form. The information is encoded and separated into multiple bitstreams, at least a subset of which are left unencrypted. Both the encrypted and unencrypted bitstreams are received and stored by the user. A user is able, for at least a limited period of time, to access the information at a first quality level, e.g., an FM-quality level for audio information, without having the corresponding decryption key, by utilizing only the unencrypted bitstreams. The user can then access an electronic-commerce web site to purchase the decryption key. The key may be downloaded from the site to an information processing device of the user, and may be utilized to decrypt the partially-encrypted format, such that the user is provided with access to the information at a second quality level higher than the first quality level, e.g., a CD-quality level for audio information. The multiple bitstreams may correspond, e.g., to subbands of at least first and second digital sidebands of a host carrier signal in an FM in-band on-channel (FM-IBOC) digital audio broadcasting system.

公开(公告)号：EP1073222A2

公开(公告)日：2001-01-31

申请号：EP00306081.1

申请日：2000-07-17

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Norr, William M.

IPC: H04H1/00

CPC classification number: H04H60/23 ,  H04H60/07 ,  H04H2201/183 ,  H04H2201/20 ,  H04K1/00 ,  H04L9/0827 ,  H04L2209/56 ,  H04L2209/80

Abstract: Audio or other information is delivered to a user via a multi-stream digital broadcasting system in a partially-encrypted form. The information is encoded and separated into multiple bitstreams, at least a subset of which are left unencrypted. Both the encrypted and unencrypted bitstreams are received and stored by the user. A user is able, for at least a limited period of time, to access the information at a first quality level, e.g., an FM-quality level for audio information, without having the corresponding decryption key, by utilizing only the unencrypted bitstreams. The user can then access an electronic-commerce web site to purchase the decryption key. The key may be downloaded from the site to an information processing device of the user, and may be utilized to decrypt the partially-encrypted format, such that the user is provided with access to the information at a second quality level higher than the first quality level, e.g., a CD-quality level for audio information. The multiple bitstreams may correspond, e.g., to subbands of at least first and second digital sidebands of a host carrier signal in an FM in-band on-channel (FM-IBOC) digital audio broadcasting system.

Abstract translation: 音频或其它信息中的部分加密的形式通过多流的数字广播系统传送给用户。该信息被编码并分成多个比特流，至少一个子集可放置保持不加密。 将加密的和未加密的比特流是用户接收和存储。 用户能够，至少在有限的时间周期，在第一质量等级，E. G.访问该信息，在FM质量水平的音频信息，而无需对应的解密密钥，通过仅利用未加密的位流。 然后，用户可以访问电子商业网站购买解密密钥。 该密钥可以从网站在用户的信息处理设备被下载到，并且可以被用于解密部分加密的格式，检查没有所述用户在第二质量水平低于第一质量更高设置有访问信息 的水平，例如，具有CD品质水平的音频信息。 所述多个比特流可以对应，E. G.，在一个主载波信号的至少第一和第二数字边带的子带以FM带内信道上（IBOC FM）数字音频广播系统。