Just like many terms associated with technology, the word 'identifier' has multiple meanings dependent on the context and application. I have always thought of an identifier akin to a filename - a unique alpha numeric combination attributed to a single asset. Some metadata standards actually have elements called the identifier. Now, this blog discusses an identifier as a security enhancement, like a watermark.
EIDR, a robust content asset identifier systems embeds deep within the asset. It is different than traditional DRM methods which focus on locking access. Rather the EIDR identifier is capable of living in every piece of the content, even in a few seconds of video. So anyone who wanted to use the content would need to go through painstaking and time consuming permutations to remove the identifier or just pay for the rights.
Interesting concept...
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