Reasons for reverse engineering:
Interoperability.
Lost documentation: Reverse engineering often is done because the documentation of a particular device has been lost (or was never written), and the person who built it is no longer available. Integrated circuits often seem to have been designed on obsolete, proprietary systems,

which means that the only way to incorporate the functionality into new technology is to reverse-engineer the existing chip and then re-design it.

Product analysis. To examine how a product works, what components it consists of, estimate costs, and identify potential patent infringement.

Digital update/correction. To update the digital version (e.g. CAD model) of an object to match an "as-built" condition.

Security auditing.

Military or commercial espionage. Learning about an enemy's or competitor's latest research by stealing or capturing a prototype and dismantling it.

Removal of copy protection, circumvention of access restrictions.

Creation of unlicensed/unapproved duplicates.

Academic/learning purposes.

Curiosity

Competitive technical intelligence (understand what your competitor is actually doing versus what they say they are doing)

 Learning: learn from others' mistakes. Do not make the same mistakes that others have already made and subsequently corrected                   

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