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The musical West Side Story, is a derivative work based on Shakespeare's Romeo and Juliet, because it uses numerous expressive elements from the earlier work. [42] However, Shakespeare's drama Romeo and Juliet is also a derivative work that draws heavily from Pyramus and Thisbe and other sources. Nevertheless, no legal rule prevents a ...
The strength of the copyleft license governing a work is determined by the extent to which its provisions can be imposed on all kinds of derivative works. Thus, the term "weak copyleft" refers to licenses where not all derivative works inherit the copyleft license; whether a derivative work inherits or not often depends on how it was derived.
Without share-alike, derivative works might be sublicensed with compatible but more restrictive license clauses, e.g. CC BY to CC BY-NC. Non-commercial (NC) Licensees may copy, distribute, display, perform the work and make derivative works and remixes based on it only for non-commercial purposes. No derivative works (ND)
The copyright law of the United States grants monopoly protection for "original works of authorship". [1] [2] With the stated purpose to promote art and culture, copyright law assigns a set of exclusive rights to authors: to make and sell copies of their works, to create derivative works, and to perform or display their works publicly. These ...
All published derivative works must use exactly the same license as the original: if you use the work, you're forced to use the same license for your own original work as well. If your work is using a different license, you can't use the copyleft license, even if your work is also using a (different) copyleft licence.
The Creative Commons icon for Share-Alike, a variant of the copyleft symbol. Copyleft is a distinguishing feature of some free software licenses. Many free software licenses are not copyleft licenses because they do not require the licensee to distribute derivative works under the same license.
Share-alike (🄎) is a copyright licensing term, originally used by the Creative Commons project, to describe works or licenses that require copies or adaptations of the work to be released under the same or similar license as the original. [1] Copyleft licenses are free content or free software licenses with a share-alike condition.
The licenses in the GPL series are all copyleft licenses, which means that any derivative work must be distributed under the same or equivalent license terms. It is more restrictive than the Lesser General Public License , and even further distinct from the more widely used permissive software licenses such as BSD , MIT , and Apache .