Limitations




Copyright law does not grant authors and publishers absolute control over the use of their work. Only certain types of works and kinds of uses are protected; only unauthorized uses of protected works can be said to be infringing.

Non-infringing usesedit

Article 10 of the Berne Convention mandates that national laws provide for limitations to copyright, so that copyright protection does not extend to certain kinds of uses that fall under what the treaty calls "fair practice", including but not limited to minimal quotations used in journalism and education. The laws implementing these limitations and exceptions for uses that would otherwise be infringing broadly fall into the categories of either fair use or fair dealing. In common law systems, these fair practice statutes typically enshrine principles underlying many earlier judicial precedents, and are considered essential to freedom of speech.

Another example is the practice of compulsory licensing, which is where the law forbids copyright owners from denying a license for certain uses of certain kinds of works, such as compilations and live performances of music. Compulsory licensing laws generally say that for certain uses of certain works, no infringement occurs as long as a royalty, at a rate determined by law rather than private negotiation, is paid to the copyright owner or representative copyright collective. Some fair dealing laws, such as Canada's, include similar royalty requirements.

In Europe, the copyright infringement case Public Relations Consultants Association Ltd v Newspaper Licensing Agency Ltd had two prongs; one concerned whether a news aggregator service infringed the copyright of the news generators; the other concerned whether the temporary web cache created by the web browser of a consumer of the aggregator's service, also infringed the copyright of the news generators. The first prong was decided in favor of the news generators; in June 2014 the second prong was decided by the Court of Justice of the European Union (CJEU), which ruled that the temporary web cache of consumers of the aggregator did not infringe the copyright of the news generators.

Non-infringing types of worksedit

In order to qualify for protection, a work must be an expression with a degree of originality, and it must be in a fixed medium, such as written down on paper or recorded digitally. The idea itself is not protected. That is, a copy of someone else's original idea is not infringing unless it copies that person's unique, tangible expression of the idea. Some of these limitations, especially regarding what qualifies as original, are embodied only in case law (judicial precedent), rather than in statutes.

In the U.S., for example, copyright case law contains a substantial similarity requirement to determine whether the work was copied. Likewise, courts may require computer software to pass an Abstraction-Filtration-Comparison test (AFC Test) to determine if it is too abstract to qualify for protection, or too dissimilar to an original work to be considered infringing. Software-related case law has also clarified that the amount of R&D, effort and expense put into a work's creation does not affect copyright protection.

Evaluation of alleged copyright infringement in a court of law may be substantial; the time and costs required to apply these tests vary based on the size and complexity of the copyrighted material. Furthermore, there is no standard or universally accepted test; some courts have rejected the AFC Test, for example, in favor of narrower criteria.

The POSAR test, a recently devised forensic procedure for establishing software copyright infringement cases, is an extension or an enhancement of the AFC test. POSAR, with its added features and additional facilities, offers something more to the legal and the judicial domain than what the AFC test offers. These additional features and facilities make the test more sensitive to the technical and legal requirements of software copyright infringement.

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