Patent ID: 9704211
Date: 2017-07-11
CPC Classifications: G06F,G06T,G10L,H04H,H04L,H04N

Claim:
1. A method for detecting a change in arrangement of sections of a content, comprising: receiving a multimedia content, the multimedia content including a plurality of watermark messages embedded therein, each embedded watermark message including a counter value such that counter values from consecutively embedded watermarks form a predefined sequence of numbers indicative of an original sequential arrangement of the multimedia content at the time of embedding of the plurality of watermark messages; extracting a plurality of watermark messages from the received multimedia content using a watermark extractor that is implemented at least partially in hardware; determining a separation between a first extracted watermark message and a second extracted watermark message within the received multimedia content; obtaining a first counter value from the first extracted watermark message and a second counter value from the second extracted watermark message; obtaining a difference between the first counter value and the second counter value; and comparing the obtained difference between the first and the second counter values with the separation between the first and the second extracted watermark messages to determine whether or not segments of the received multimedia content that include the first watermark message and the second watermark message have been rearranged from the original sequence of arrangement.