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Glossary

What is copyright and AI training?

This is the unresolved legal question of whether training a model on copyrighted text or images, without a license, counts as infringement, and it is currently being fought out in courts rather than settled by any clear rule.

Publishers often assume that blocking a crawler protects their copyright, and that allowing one means consenting to infringement. Neither follows automatically. Blocking access is a technical decision about who can fetch a page; whether the resulting use of any copyrighted material is lawful is a separate legal question that depends on the court, the specific use, and doctrines like fair use in the US, a principle that can excuse copying without permission when a judge decides the new use is different enough in purpose or effect, decided case by case rather than by fixed rule.

The practical result is that a robots.txt entry is not legal advice and not a waiver either way. A site that blocks every AI crawler has not necessarily protected itself from a model trained on a copy obtained elsewhere, and a site that allows every crawler has not necessarily granted any rights beyond what the crawler's stated purpose covers.

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