DeCSS

Rarity: Common

The most frequent rarity: most Wikipedia articles become Commons.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

At a glance

Class

Invention

Domain

Science and technology

Knowledge cost

2

In collections

Nobody has pulled it yet.

What Wikipedia says

DeCSS is one of the first free computer programs capable of decrypting commercially produced DVD-Video discs. Before the release of DeCSS, free and open source operating systems (such as BSD and Linux) could not play encrypted video DVDs.

Excerpt from the Wikipedia article “DeCSS”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: en:User:Quadell, GPL, via Wikimedia Commons.