Cryptography – Video cryptography – Video electric signal modification
Reexamination Certificate
2011-03-22
2011-03-22
Zia, Syed A. (Department: 2431)
Cryptography
Video cryptography
Video electric signal modification
C380S231000, C380S230000, C380S233000, C380S239000, C380S210000, C713S155000, C713S159000, C713S189000, C713S193000, C709S231000, C709S229000
Reexamination Certificate
active
07912218
ABSTRACT:
The invention proposes to divide a content to be transmitted via a network into a set of slices and to generate a set of files from this set of slices. The slices (or the files) are encrypted before downloading in such a way that the client cannot use the slice (or the file) before having acquired the associated decryption key. The invention thereby allows protecting a downloaded content on a slice-by-slice basis (or on a file-by-file basis) rather than protecting a downloaded content as a whole. The transmission (in download mode) between the server and the client is ruled by the HTTP protocol that is accepted by all firewalls and NAT. Consequently, the transmitted content is accessible for any client device that has access to the Web without restriction. Advantageously, the slices can be decoded independently of each other.
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NXP B.V.
Zia Syed A.
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