Asignature (/ˈsɪɡnɪtʃər,ˈsɪɡnətʃər/; fromLatin:signare, "to sign") is a depiction of someone's name, nickname, or even a simple "X" or other mark that a person writes on documents as a proof of identity and intent. Signatures are often, but not always,handwritten or stylized. The writer of a signature is asignatory orsigner. A signature may be confused with anautograph, which is chiefly an artistic signature. This can lead to confusion when people have both an autograph and signature and as such some people in the public eye keep their signatures private whilst fully publishing their autograph.
The traditional function of a signature is to permanently affix to a document a person's uniquely personal, undeniable self-identification as physical evidence of that person's personal witness and certification of the content of all, or a specified part, of the document. For example, the role of a signature in many consumercontracts is not solely to provide evidence of the identity of the contracting party, but also to provide evidence of deliberation and informed consent.
In the United States, signatures encompass marks and actions of all sorts that are indicative of identity and intent. The legal rule is that unless a statute specifically prescribes a particular method of making a signature it may be made in any number of ways. These include by a mechanical or rubber stampfacsimile. A signature may be made by the purported signatory; alternatively someone else duly authorized by the signatory, acting in their presence and at their direction, may make the signature.[2]
Many individuals have much more fanciful signatures than their normalcursive writing, including elaborateascenders,descenders and exoticflourishes, much as one would find incalligraphic writing. As an example, the final "k" inJohn Hancock's famous signature on the US Declaration of Independence loops back to underline his name. This kind of flourish is also known as aparaph, aFrench term meaning flourish, initial or signature. The paraph is used ingraphology analyses.
Several cultures whose languages use writing systems other than alphabets do not share the Western notion of signatures per se: the "signing" of one's name results in a written product no different from the result of "writing" one's name in the standard way. For these languages, to write or to sign involves the same written characters.
Mark in lieu of signature
Fingerprints may be used instead of signatures where the signer is illiterate, such as this Indian legal document from 1952
In some jurisdictions, anilliterate signatory can make a "mark" (often an "X" but occasionally a personalized symbol) on legal documents, so long as the document is countersigned by a literate witness.[3] Courts inEngland and Wales are generally likely to recognise such a mark as legally valid.[4] In some countries, illiterate people place a thumbprint on legal documents in lieu of a written signature.
徐永裕印;Xú Yǒngyù yìn, rotating character seal ofXú Yǒngyù
Special signature machines, calledautopens, are capable of automatically reproducing an individual's signature. These are typically used by people required to sign a lot of printed matter, such as celebrities, heads of state or CEOs.[5] More recently,Members of Congress in the United States have begun having their signature made into aTrueType font file. This allows staff members in the Congressman's office to easily reproduce it on correspondence, legislation, and official documents. In the East Asian languages ofChinese,Japanese, andKorean, people traditionally use stamp-like objects known asname-seals with the name carved intensho script (seal script) in lieu of a handwritten signature.[citation needed]
Wet signatures
A wet signature is a person's name written in their own hand with ink. Some government agencies require that professional persons or official reviewers sign originals and all copies of originals to authenticate that they personally viewed the content. In many countries, signatures must be made, witnessed and recorded in the presence of anotary public to carry legal force in specific contexts. In the United States this is prevalent with architectural and construction plans.
Ine-mail andnewsgroup usage, another type of signature exists which is independent of one's language. Users can set one or more lines of custom text known as asignature block to be automatically appended to their messages. This text usually includes a name, contact information, and sometimes quotations andASCII art. A shortened form of a signature block, only including one's name, often with some distinguishing prefix, can be used to simply indicate the end of apost or response. Some web sites also allow graphics to be used. Note, however, that this type of signature is not related toelectronic signatures ordigital signatures, which are more technical in nature and not directly understandable by humans.
Handwriting experts say "it is extremely difficult for anyone to be able to figure out if a signature or other very limited writing sample has been forged."[6]High volume review of signatures, to decide if a signature is true or forged, occurs when election offices decide whether to acceptabsentee ballots arriving from voters,[7]and possibly when banks decide whether to paychecks.[8][9] The highest error rates in signature verification are found with lay people, higher than for computers, which in turn make more errors than experts.[10]
There have been concerns that signature reviews improperly reject ballots from young and minority voters at higher rates than others, with no or limited ability of voters to appeal the rejection.[11][12] When errors are made with bank checks, the payer can ask the bank for corrections.
In 2018, a fifth of adults in the United Kingdom said they sign so rarely they have no consistent signature, including 21% of people 18-24 and 16% of people over age 55. 55% of UK adults said they rarely sign anything.[13]
Researchers have published error rates for computerized signature verification. They compare different systems on a common database of true and false signatures. The best system falsely rejects 10% of true signatures, while it accepts 10% of forgeries. Another system has error rates on both of 14%, and the third-best has error rates of 17%.[14][15] It is possible to be less stringent and reject fewer true signatures, at the cost of also rejecting fewer forgeries.[16] Computer algorithms:
look for a certain number of points of similarity between the compared signatures ... a wide range of algorithms and standards, each particular to that machine's manufacturer, are used to verify signatures. In addition, counties have discretion in managing the settings and implementing manufacturers' guidelines ... there are no statewide standards for automatic signature verification ... most counties do not have a publicly available, written explanation of the signature verification criteria and processes they use.[17]
In an experiment, experts rejected 5% of true signatures and 71% of forgeries. They were doubtful about another 57% of true signatures and 27% of forgeries. If computer verification is adjusted to reflect what experts are sure about, it will wrongly reject 5% of true signatures and wrongly accept 29% of forgeries. If computers were adjusted more strictly, rejecting all signatures which experts have doubts about, the computers would set aside 62% of true signatures, and still wrongly accept 2% of forgeries. Lay people made more mistakes and were doubtful less often, though the study does not report whether their mistakes were to accept more forgeries or reject more true signatures.[18]
Voters with short names are at a disadvantage, since experts make more mistakes on signatures with fewer "turning points and intersections." Participants in this study had 10 true signatures to compare to, which is more than most postal ballot verifications have.[18] A more recent study for the US Department of Justice confirms the probabilistic nature of signature verification, though it does not provide numbers.[10]
Thesignature on a painting or other work of art is an important factor in assessingprovenance. Fake signatures are sometimes added to enhance the value of a painting, or are added to a fake painting to support its authenticity. A notorious case was the signature ofJohannes Vermeer on the fake "Supper at Emmaus" made by the art forgerHan van Meegeren. However, the fact that painters' signatures often vary over time (particularly in the modern and contemporary periods) might complicate the issue. The signatures of some painters take on an artistic form that may be of less value in determining forgeries.
If a painting isabstract orambiguous, the signature may be the only clue to determine which side is up.
Copyright
Under British law, the appearance of signatures (not the names themselves) may be protected undercopyright law.[19]
UnderUnited States copyright law, "titles, names [I c...]; mere variations of typographic ornamentation, lettering, or coloring" are not eligible for copyright;[20] however, the appearance of signatures (not the names themselves) may be protected under copyright law.[19]
Uniform Commercial Code
Uniform Commercial Code §1-201(37) of the United States generally definessigned as "using any symbol executed or adopted with present intention to adopt or accept a writing". The Uniform Commercial Code §3-401(b) fornegotiable instruments states "A signature may be made (i) manually or by means of a device or machine, and (ii) by the use of any name, including atrade or assumed name, or by a word, mark, or symbol executed or adopted by a person with present intention to authenticate a writing."
See also
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^These systems handle scanned ("offline") signatures from multiple people ("WI, writer-independent").Hafemann, Luiz G.; Sabourin, Robert; Oliveira, Luiz S. (2017-10-16). "Offline handwritten signature verification — Literature review".2017 Seventh International Conference on Image Processing Theory, Tools and Applications (IPTA). IEEE. pp. 1–8.arXiv:1507.07909.doi:10.1109/IPTA.2017.8310112.ISBN978-1-5386-1842-4.S2CID206932295.
^abSpilsbury, Sallie (2000).Media Law. Cavendish Publishing. p. p. 439.ISBN978-1-85941-530-6.An individual's signature may be protected under law as an artistic work. If so, the unauthorised reproduction of the signature will infringe copyright. The name itself willnot be protected by copyright; it is theappearance of the signature which is protected.
