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What is the difference between ISCC and ACR software?

The ISCC makes use of technologies related to ACR (automatic content recognition technologies) to come up with a new short and generic standard identifier for digital content – but ISCC is not an ACR. The following table provides a comparison between the ISCC system and ACR technology.
ISCC is an open standard proposal
ACRS are mostly complex services operated with proprietary software
ISCC creates a short identifier string
ACRS do not provide a short, public identifier string
ISCC can identify digital assets in all media formats
ACRS is not an identifier but an identification system
ISCC is generated by a combination of multiple fingerprints and cryptographic hashing algorithms
ACRS works with large and granular fingerprints and special indexing systems
ISCC has near duplicate content-matching capabilities (lightweight fingerprints)
ACRS is developed for content matching, can match and compare assets and small chunks in great detail
ISCC cannot analyse content in detail
ACRS can compare assets and small chunks in great detail
A short identifier string can be stored in databases or on blockchains very efficiently
ACRS are complex systems that requires database indexing technologies and large storage capacities
The ISCC is optimised for the use on blockchains
It is not possible to easily store and openly provide large fingerprints
ISCC can easily be implemented in existing applications and services
Most ACRS depend on external services and cannot easily be implemented in existing applications
ISCC ensures interoperability of content-related processes across creators, intermediaries, retailers and other organisations, systems or repositories
Fingerprints are not interoperable
A short identifier string allows for automated machine-to-machine communication and transactions
ACRS do not provide a short fingerprint-based identifier
ISCC can be created by anyone with access to the content file
ACRS often requires using proprietary software and indexing/matching services
ISCC can be used for all media content types
ACRS are often optimised for specific media types
Source: ISCC Foundation (T. Pan, S. Posth)