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Royalty-free (RF) material subject to copyright or other intellectual property rights may be used without the need to pay royalties or license fees for each use, per each copy or volume sold or some time period of use or sales.
Like "free beer", positive liberty promises equal access by all without cost or regard to income, of a given good (assuming the good exists). Like "free speech", negative liberty safeguards the right to use of something (in this case, speech) without regard to whether in a given case there is a cost involved for this use. [c]
The following list is meant to help you with your own research, by offering links to respectable information sources on the web, available free of charge. Inclusion on the list doesn't automatically mean the absolute truth is on these websites, so always be critical and compare information between different sources.
Three high level models of paywall have emerged: hard paywalls that allow no free content and prompt the user straight away to pay in order to read, listen or watch the content, soft paywalls that allow some free content, such as an abstract or summary, and metered paywalls that allow a set number of free articles that a reader can access over a specific period of time, allowing more ...
This is a list of open-access journals by field. The list contains notable journals which have a policy of full open access. It does not include delayed open access journals, hybrid open access journals, or related collections or indexing services.
As few non-free works are used as is practical. Those works are reasonably low-quality and, if possible, cropped to only show the relevant parts.Vector images, such as File:Princeton shield.svg, may be used if otherwise appropriate, but they should be rendered at reasonably low resolutions within articles (cf. Princeton University).
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Free content, libre content, libre information, or free information is any kind of creative work, such as a work of art, a book, a software program, or any other creative content for which there are very minimal copyright and other legal limitations on usage, modification and distribution.