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| Comparison to public domain | |
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Computer Associates Int'l v. Altai used the term "public domain" to refer to works that have become widely shared and distributed under permission, rather than work that was deliberately put into the public domain. However, such licences are not actually equivalent to releasing a work into the public domain.
Permissive licences often do stipulate some limited requirements, such as that the original authors must be credited (attribution). If a work is truly in the public domain, this is usually not legally required, but a United States copyright registration requires disclosing material that has been previously published,[2] and attribution may still be considered an ethical requirement in academia.
[edit] Tags:Edit,Computer Associates Int'l V. Altai,Copyright,Licences,Public Domain, | |
| Comparison to Copyleft | |
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Further information: Copyleft
Copyleft is "a general method for making a program or other work free, and requiring all modified and extended versions of the program to be free as well."[3] By comparison with permissive licences, copyleft licensing places more requirement in terms of distribution and combination with software under other licences.
[edit] Tags:Copyleft, | |
| Other terms | |
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Copycenter is a term originally used to explain the modified BSD licence, a permissive free software licence. The term was presented by Kirk McKusick, a computer scientist famous for his work on BSD, during one of his speeches at BSDCon 1999. It is a word play on copyright, copyleft and copy center.
“
The way it was characterized politically, you had copyright, which is what the big companies use to lock everything up; you had copyleft, which is free software's way of making sure they can't lock it up; and then Berkeley had what we called ‘copycenter’, which is ‘take it down to the copy center and make as many copies as you want.’
”
[4]
The liberty to 'make as many copies as you want' is in fact also provided by all copyleft licences. However, unlike both copyleft licences and copyright law, permissive free software licences do not control the licence terms that a derivative work falls under. Nevertheless, the quote describes the permissive licence users' unconcern for the discussion on freedoms.
[edit] Tags:Free Software Licence,Free Software,Modified Bsd Licence,Kirk Mckusick,Computer Scientist,Bsdcon,Word Play, | |
| Copyleft compatibility | |
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Some permissive free software licences contain clauses that make them incompatible with copyleft licences. One example is clauses requiring advertising materials to credit the copyright holder. Licences with this type of advertising clause include the 4-clause BSD licence, the PHP License, and the OpenSSL Licence.
Examples of permissive free software licences without advertising clauses are the MIT License, the 3-clause BSD license, the Zlib License, and all versions of the Apache License except 1.0.
Some licences do not allow derived works to add a restriction that says a redistributor cannot add more restrictions.[citation needed] Examples include the CDDL and MsPL. However such restrictions also make the licence incompatible with permissive free software licences.
[edit] Tags:Mit License,Php License,Bsd License,Zlib License,Apache License,Cddl,Mspl, | |
| See also | |
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Wikibooks has a book on the topic of
FOSS Licensing
Free software portal
Free software licence
Comparison of free software licences
List of FSF approved software licences
List of OSI approved software licences
[edit] Tags:Free Software Portal,Comparison Of Free Software Licences,List Of Fsf Approved Software Licences,List Of Osi Approved Software Licences, | |
| References | |
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^ "Copyfree Standard Definition". Copyfree Initiative. http://copyfree.org/standard.
^ US Copyright Office Form CO; see also Ashton-Tate v. Fox
^ "What is Copyleft". GNU. http://www.gnu.org/copyleft/copyleft.html. Retrieved 21 April 2011.
^ The Jargon File contributors (2006). "copycenter". The Jargon File. Eric S. Raymond. http://catb.org/~esr/jargon/html/C/copycenter.html. Retrieved June 14, 2006.
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