to claim copyright even for type-in programs that were previously seen as PD. Only slowly did PD software authors start to include explicit relinquishment or license statement texts. Examples of modern PD software (post 1988) These examples of modern PD software (after the Berne Convention Implementation Act of 1988) are either under proper public domain (e.g. created by a US governmental organization), under a proper public domain like license (for instance CC0), or accompanied by a clear waiver statement from the author. Whilst not as widespread as in the pre-2000s, PD software still exists nowadays. For example, SourceForge listed 334 hosted PD projects in 2016, and GitHub 102,000 under the Unlicense alone in 2015. In 2016, an analysis of the Fedora Project's packages revealed PD was the seventh most popular "license". The award-winning video game developer Jason Rohrer releases his works into the PD, as do several cryptographers, such as Daniel J. Bernstein, Bruce Schneier and Douglas Crockford, with reference implementations of cryptographic algorithms. BLAST (1990) CERN's httpd (1993) ImageJ (1997) Serpent (cipher) (1999) SQLite (2000) reStructuredText (2002) I2P (2003) youtube-dl (2006) 7-Zip's LZMA SDK (2008) Diamond Trust of London (2012) Glitch (2013) The Castle Doctrine (2014) SHA-3 (2015) One Hour One Life (2018) See also Public domain Public copyright license License-free software Free and open-source software Abandonware References External links