James S. Heller,  The Librarian's Copyright Companion (2012)

“ Letting others use the works your library publishes will increase the social benefits of your publishing efforts. A good way to grant copyright permissions is through open licenses. Think of these like copyright notices, but for granting permission rather than reserving rights. By using an open license, you grant blanket permission to anyone who wishes to use your works, subject to conditions prescribed by you. ”
Source: Wikisource

Timothy K. Armstrong,  Shrinking the Commons: Termination of Copyright Licenses and Transfers for the Benefit of the Public (2010)

“ This is not, of course, to deny the possibility of dual licensing: a prospective licensee dissatisfied with some of the conditions of an open-content license may negotiate with the work’s author for a license on different terms. [31] Absent dual licensing, however, a licensee who is willing to observe the conditions stated in an open-content license is free to use the work without the particularized approval of (and indeed, without notice to) the licensor. ”
Source: Wikisource

Timothy K. Armstrong,  Shrinking the Commons: Termination of Copyright Licenses and Transfers for the Benefit of the Public (2010)

“ A court might just as readily reason that when members of the public receive a grant of rights under an open-content license, they do so with express statutory notice that all such grants are terminable and can have no reasonable basis for relying on the license being permanent. ”
Source: Wikisource

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