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Snippet from Wikipedia: Shadow library

Shadow libraries are online databases of readily available content that is normally obscured or otherwise not readily accessible. Such content may be inaccessible for a number of reasons, including the use of paywalls, copyright controls, or other barriers to accessibility placed upon the content by its original owners. Shadow libraries usually consist of textual information as in electronic books, but may also include other digital media, including software, music, or films.

Examples of shadow libraries include Anna's Archive, Library Genesis, Sci-Hub and Z-Library, which are popular book and academic shadow libraries and may be the largest public libraries for books and literature.

Creative Commons Attribution-Share Alike 4.0

Research:

• Shadow library on Wiktionary
• Shadow library on Wikipedia
• Shadow library on DuckDuckGo
• Shadow library on O'Reilly
• Shadow library on GitHub
• Shadow library on Reddit
• Shadow library on StackOverflow
• Shadow library on scholar.google.com
• Shadow library on YouTube

Fair Use Sources:

• Shadow library on DuckDuckGo

• Shadow library for Archive Access for Fair Use Preservation, quoting, paraphrasing, excerpting and/or commenting upon