week 456

• Public Domain Software – is a software that has been placed in the public domain: in other words, there is absolutely no ownership such as copyright, trademark, or patent.
• Berne Convention - (deals with the protection of works and the rights of their authors),an author automatically obtains the exclusive copyright to anything they have written, and local law may similarly grant copyright, patent, or trademark rights by default.
• The GPL series are all copyleft licenses, which means that any derivative work must be distributed under the same or equivalent license terms
• GPLv1 released in 1989 - stated that modified versions, as a whole, had to be distributed under the terms in GPLv1.
• GPLv2 released in 1991 - was the "Liberty or Death" clause, as he calls it – Section 7.
• GPLv3 released in 2007 - The concept of "software propagation", as a term for the copying & duplication of software, was explicitly defined.
• Libre Software - is also known as "Free Software”, but this is usually where the definition becomes skewed.
• Libre Documentation - is documentation that one can copy or enhance as long as these inherent freedoms are met.
• Copyright - exist in order to protect authors of documentation or software from unauthorized copying or selling of their work. A copyright infers that only with the author's permission may such activities take place.
• Copyleft - on the other hand, provides a method for software or documentation to be modified, and distributed back to the community, provided it remains Libre.