What is the DMCA? The Digital Millennium Copyright Act explained
The Digital Millennium Copyright Act, usually shortened to DMCA, is the United States law that governs copyright online. It is the reason platforms remove infringing uploads when they are notified, and the reason they are not automatically liable for what their users post.
What the law actually does
The DMCA sets out a notice-and-takedown system. A rights holder notifies the service hosting infringing material, the service removes it, and the uploader may reply with a counter notice.
It also makes it unlawful to circumvent technical copy protection, which is why cracking a licence check is treated separately from copying the file.
Safe harbour, in one sentence
A host keeps legal protection for user uploads as long as it does not know about infringement and removes it promptly once properly notified. That single rule shapes almost every content platform on the internet.
What it means for creators
You do not need a lawyer or a lawsuit to get a pirated copy removed. You need an accurate notice sent to the right host, and you need to send it before mirrors multiply.
Where it stops working
Hosts outside the United States are not bound by it, though most still honour notices. And the law says nothing about speed, which is why a reporting network that finds links early matters more than the paperwork itself.
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