Here, Chicago Law School lays out the problems and relationship between "copyright law, borrowed images, and appropriation art".  Appropriation art borrows images from the mass media and elsewhere and incorporates them in new ways into art.  The motive is to change the way we look at that object.  There are various problems to the theory including: "A constructs several identical sculptural works based on B's copyrighted photograph or comic book character." which applies directly to Koons, and his work, String of Puppies.  Apart from not being that transformed from the original, Koons' version of the photograph most likely did not take away from the financial market of the original, as the intent of this artistic work is entirely different - it is intended for display in a gallery, or in someone's home.  However, Koons argued that it was fair use on the grounds that he was making satirical comment on mass culture in society.  The court did not buy this defense, as his work did not apply to directly to the appropriated work.  This tag is useful in making us question what exactly constitutes appropriation art, and the relationships between the borrowed images and how they are used.  The fact that appropriation art is part of the history of art acknowledges it as a valid genre or term.  However, Koons it testing those boundaries to the point that he is criticized that he is making a mockery of art.  Appropriation art has other drawbacks in that it goes both ways in promoting new art but at the same time limiting it.  Artists are less likely to come up with their own original images.  The article also underlines that we cannot merely label something as 'art' and therefore expect it to be exempt from copyright.  This would leave judges in a extremely subjective and difficult position of deciding what is art.

This article from Art Law department at Harvard explains that artists have certain rights within the creation of their works.  One-way is through appropriation art: the quoting of work from other artists.  Artists borrows elements from the original that may stay completely unchanged, however, the new work uses the original to create something new.  Appropriation art took place as far back as Raphael’s Judgment of Paris c.1515, which was since lost but one of the artist’s employees, Raimondi, made an etching of it, which proceeded to be copied over and over.  Three centuries later, Manet took part of this image and inserted it into his painting, Le Dejeuner Sur L’Herbe.  A century later, Picasso translated Manet’s work in a series of paintings.   Thus, artists’ have always relied on being inspired and influenced by earlier works.

The Roger v. Koons (1992) case, wherein Jeff Koons commissioned a sculpture of Art Roger's photograph postcard, and in so doing, violated Rogers’ copyright of his original work, is regarded as the primary modern day case of appropriation art.  Koons’ work copies the original exactly, although the puppies are painted a vivid blue, have bulbous noses, and the two figures are decorated with three flowers, which does not occur in the original.

Koons has been in a number of cases in which he has tried to argue for parody or satire, for example, in order to deem his work transformative enough from the original, and thus fair use.  Appropriation art is a major get-out-of-jail free card, that gives artists the ‘artistic license’ that is arguably essential in creating great works, as exemplified by the fact that the most well recognized artists have been doing this for centuries.