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In case of a photograph or screenshot, you must also own the copyright for all copyright-protected items (e.g. statue or app) that appear in it (example, see below for details). Freely licensed: You can prove that the copyright holder has released the image under an acceptable free license (example, see below for details). Note that images that ...
Also may mean "Perspective Control" for a lens that has the ability to shift to tilt to control linear perspective in an image. May also stand for personal computer in conjunction with digital photography. PDAF: Phase-detection autofocus. One of the mechanisms of automatic lens focusing. PF: Purple fringing. A form of chromatic aberration in ...
Fragile watermarks are commonly used for tamper detection (integrity proof). Modifications to an original work that clearly are noticeable, commonly are not referred to as watermarks, but as generalized barcodes. A digital watermark is called semi-fragile if it resists benign transformations, but fails detection after malignant transformations ...
The copyright symbol, or copyright sign, designated by (a circled capital letter "C"), is the symbol used in copyright notices for works other than sound recordings.
The most important things to remember are that all creative work generates a new copyright by default, and the absence of a copyright notice does not mean it is in the public domain. A common misunderstanding is that works that have been made available to the public are in the public domain, or can be used for any purpose; this is not the case.
The copyright notice must also contain the year in which the work was first published (or created), and the name of the copyright owner, which may be the author (including the legal author/owner of a work made for hire), one or more joint authors, or the person or entity to whom the copyright has been transferred.
The author, or the licensor in case the author did a contractual transfer of rights, needs to have the exclusive rights on the work. If the work has already been published under a public license, it can be uploaded by any third party, once more on another platform, by using a compatible license, and making reference and attribution to the original license (e.g. by referring to the URL of the ...
The basic right when a work is protected by copyright is that the holder may determine and decide how and under what conditions the protected work may be used by others. This includes the right to decide to distribute the work for free. This part of copyright is often overseen.
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