The instant appeal arises from the denial of a preliminary injunction in an action for copyright infringement. In this appeal, Plaintiff-Appellant Country Kids ’N Slicks, Inc. (“Plaintiff’) contends that the district court erred in ruling for purposes of the preliminary injunction that Defendants-Ap-pellees Vickie Sheen, Bill Sheen, Flake Wells, and LaDawn Bragg, d/b/a Carousel Kids (collectively “Defendants”) did not establish infringement on its copyrights describing certain wooden dolls modelled after the traditional paper dolls. Specifically, Plaintiff argues that the district court erred as a matter of law by: (1) holding that the medium, size and shape of the dolls are not copyrightable features; (2) misinterpreting the standard for copyright infringement by requiring Plaintiff to show that the Defendants’ dolls were a “virtual copy” of Plaintiffs dolls; and (3) requiring that Plaintiff establish the likelihood of bankruptcy in order to meet the irreparable injury requirement for issuing a preliminary injunction. We AFFIRM the district court’s holding that the medium, size and shape of the dolls are not copyrightable features. However, with regard to other features of the dolls, we cannot discern whether the district court utilized the correct legal standard for copyright *1283 infringement or properly determined that Plaintiff was entitled to a presumption of irreparable harm in the event of copyright infringement. Therefore, on those issues we VACATE the judgment of the district court and REMAND this case for further proceedings.
BACKGROUND
Plaintiff, who does business under the name Crayon Kids, is a wholesale doll manufacturer that sells wooden dolls created by Country Kids ’N Slicks, Inc.’s President, Pam Laughlin (“Laughlin”). Plaintiff holds copyrights on the various dolls it produces. Laughlin conceived of the concept of the wooden doll when she noticed that her five-year-old daughter had difficulty keeping the clothing on paper Barbie dolls. Based on this concept, Laughlin founded Country Kids, and began producing a line of wooden dolls. Plaintiffs wooden dolls all employ a similar size and shape to the traditional paper dolls.
In mid-1993, Plaintiff discovered that Vickie Sheen, a former employee of Country Kids, had begun marketing her own models of wooden dolls. Ms. Sheen’s husband, Bill Sheen, Mr. Sheen’s sister, LaDawn Bragg, and Mr. Flake Wehs III all assisted her in this effort. Defendants, who marketed their dolls under the name “Carousel Kids,” did not obtain a license to use Plaintiffs copyright and clearly had access to the design of Plaintiffs dolls. While employing the basic concept of Plaintiffs dolls, Defendants claimed that their dolls had distinctly different features {e.g., hair, eyes, nose, mouth, cheeks, etc.).
After learning of Defendants’ dolls, Plaintiff filed suit and requested a preliminary injunction to prevent Defendants from marketing their Carousel Kids dolls. At a hearing, Plaintiff presented evidence that Defendants lured away some of Plaintiffs sales representatives, sold their dolls at lower prices, and that some customers could not differentiate between the two brands of dolls. Defendants, however, dispute the extent of any such confusion. Plaintiff also suggested that the competition of Defendants’ dolls would force both companies into bankruptcy. The district court denied the motion for a preliminary injunction on the grounds that Plaintiff could not demonstrate either a likelihood of success on the merits or a threat of irreparable harm. Plaintiff now appeals, and we exercise jurisdiction under 28 U.S.C. § 1292(a).
DISCUSSION
We consider this case on appeal from a denial of a preliminary injunction to restrain an alleged infringement of Plaintiffs copyright in violation of 17 U.S.C. § 502(a). In order to merit a preliminary injunction, Plaintiff must establish that: (1) it has a substantial likelihood of prevailing on the merits; (2) it will suffer irreparable injury if it is denied the injunction; (3) its threatened injury outweighs the injury that the opposing party will suffer under the injunction; and (4) an injunction would not be adverse to the public interest.
Autoskill, Inc. v. Nat’l Educ. Support Sys., Inc.,
We review the district court’s denial of Plaintiffs application for a preliminary injunction to determine if the distinct court “abuse[d] its discretion, commit[ted] an error of law, or [wa]s clearly erroneous in its preliminary factual findings.”
Autoskill,
A.. Plaintiffs Likelihood of Success on the Merits
In order to prevail on its copyright infringement claim, Plaintiff must establish both: (1) that it possesses a valid copyright and (2) that Defendants “copied”
2
protectable elements of the copyrighted work.
Feist Pubs., Inc. v. Rural Tel. Serv. Co.,
While the fact of copying is difficult to prove directly, Plaintiff can indirectly prove copying by establishing that Defendants had access to the copyrighted work and that there are probative similarities between the copyrighted material and the allegedly copied material.
4
Gates Rubber,
Thus, the question of whether Defendants infringed on Plaintiffs copyright turns on whether Defendants’ product is substantially similar to the protectable elements of Plaintiffs product. To make this determination, we find it useful to apply the “abstraction-filtration-comparison” test.
See Autos-kill
1. The Abstraction and Filtration Analysis
The district court ruled that although the dolls’ specific features were protected, Plaintiffs copyright did not extend to the size, shape and medium of the dolls. This ruling stemmed from the court’s application of the Copyright Act, which provides in relevant part that:
[i]n no case does copyright protection for an original work of authorship extend to any idea, procedure, process, system, method of operation, concept, principle, or discovery, regardless of the form in which it is described, explained, illustrated, or embodied in such work.
17 U.S.C. § 102(b). This provision differentiates between expression and ideas — withholding protection for ideas so that they can remain in the public domain and provide a general benefit to society.
See, e.g., Autos-kill,
Because the idea/expression distinction is somewhat elusive, courts often adopt an ad hoc approach, eschewing the application of any bright line rule or any clear formula.
See Peter Pan Fabrics, Inc. v. Martin Weiner Corp., 274
F.2d 487, 489 (2d Cir.1960) (“Obviously, no principle can be stated as to when an imitator has gone beyond copying the ‘idea,’ and has borrowed its ‘expression’ ” so such decisions must “inevitably be
ad hoc”); see also Gund, Inc. v. Smile Int'l Inc.,
Plaintiff claims that the district court erred in not affording copyright protection to the size, shape and medium of the doll — that is, in setting the level of abstraction so low as to view the Plaintiffs wooden doll as an idea rather than as a protectable form of expression. In attempting to focus on the originality of its creation, Plaintiff invokes
Fisher-Price Toys, Div. of Quaker Oats Co. v. My-Toy Co.,
In the instant case, we conclude that the district court correctly characterized the wooden form of the traditional paper doll as an idea rather than a protected expression. Plaintiffs cannot demonstrate infringement merely because Defendants produced wooden paper dolls; nor may they rely on similarities between their work and Defendants’ work that necessarily stem from this unprotectable idea.
See, e.g., Concrete Mach. Co. v. Classic Lawn Ornaments, Inc.,
(1st Cir.1988) (appellant cannot prohibit others from appropriating its idea of life-size, “realistic-looking concrete deer”; only substantial similarity in specific features could support an infringement claim);
Aliotti v. R. Dakin & Co.,
Moreover, to the extent that the shape and size of Plaintiffs dolls are not inherent in the idea of a wooden paper doll, they are typical paper doll features found in the public domain and therefore are not copyrightable.
See, e.g., Eden Toys, Inc. v. Marshall Field & Co.,
Our judgment that the wooden doll is a non-copyrightable idea is reinforced by the Copyright Act’s focus on artistic innovation and its refusal to offer protection to utilitarian qualities. The Copyright Act’s definition of protectable pictorial, graphic and sculptural works sets out this distinction: “Such works shall include works of artistic craftsmanship insofar as their form but not their mechanical or utilitarian aspects are concerned.” 17 U.S.C. § 101. Therefore, not only is the idea of a wooden doll not copyrightable, but any basic and utilitarian aspects of the dolls, such as the shape of a human body and standard paper doll poses which are both friendly and inviting and also utilitarian in their ease of manufacture and adaptability to' the attachment of various wardrobes, cannot be copyrighted.
See Durham Indus.,
Accordingly, we affirm the district court’s holding that the size, shape and medium of Plaintiffs dolls are not protectable, and that copyright infringement cannot be demonstrated by Defendants’ copying of these elements. The issue of which remaining features of Plaintiffs dolls may be copyrightable has not been raised on appeal, and we therefore do not address it. 8
2. The Proper Test for Infringement
After filtering out the unprotectable elements of a work, a court must determine whether “those protectable portions of the original work that have been copied constitute a substantial part of the original work— i.e. a matter that is significant in the plaintiffs [product].”
Gates Rubber,
The traditional test for substantial similarity is “whether the accused work is so similar to the plaintiffs work that an ordinary reasonable person would conclude that the defendant unlawfully appropriated the plaintiffs protectible expression by taking material of substance and value.”
Atari,
In this context, we believe the “ordinary observer” test is an appropriate method for the court to use in its comparison analysis.
See, e.g., Concrete Mach. Co.,
Although the district court invoked the ordinary observer test, it does not appear that this test was correctly applied. At one point in its oral ruling the district court stated that “Defendants would infringe only by copying these appliques with such detail and particularity that an ordinary observer would ... confuse a particular Carousel doll with one of the very Crayon dolls shown in Plaintiffs Exhibits One and Two.” Aplt.App. 183-84. Later in its oral ruling, it ultimately concluded that an ordinary observer “would not conclude that any current doll in Defendants’ production is a
virtual copy
of any given, particular doll [manufactured by Plaintiff].” Aplt.App. 184 (emphasis added). However, a finding of substantial similarity does not require that an infringing work be a “virtual copy” of a protected one. Nor is the
sine qua non
of substantial similarity whether an ordinary observer would “confuse” the two works in their entirety. Rather, as stated above, the test is whether the accused work is sufficiently similar that an ordinary observer would conclude that the defendant unlawfully appropriated the plaintiffs pro-tectable expression by taking material of substance and value.
Atari,
B. The Irreparable Injury Standard
Our decision to reverse the district court’s ruling on Plaintiffs likelihood of success on the merits requires us to consider the court’s alternative ruling that Plaintiffs failed to demonstrate that they would suffer an irreparable injury without the issuance of the injunction. In ruling that Plaintiffs failed to demonstrate that they would suffer an irreparable injury, the district court found no evidence that “competition from Carousel Kids is causing substantial financial harm or a danger of Plaintiffs bankruptcy.” Aplt. App. at 111. The district court did not consider whether to adopt the prevailing view in cases of copyright infringement that a showing of likelihood of success on the merits raises a presumption of irreparable harm.
See, e.g., National Football League v. McBee & Bruno’s, Inc.,
CONCLUSION
We AFFIRM the ruling of the district court that the medium, size and shape of Plaintiffs dolls are not copyrightable features. With regal’d to other features of the dolls, we VACATE the rulings of the district court on the issues of substantial similarity and irreparable injury, and we REMAND for further proceedings in accordance with the principles set forth in this opinion.
Notes
. Despite Plaintiff's counsel's suggestion to the contrary at oral argument, Plaintiff has not appealed the ultimate factual finding as to whether the actual features of Defendants' dolls infringed on Plaintiff's copyright. Plaintiff's "Statement of Issues Presented For Review” explicitly limited *1284 this appeal to the district court’s purported errors of law, and Plaintiff's Reply Brief explained that "the issues raised on appeal relate to whether the trial court applied the appropriate legal standards and not whether Carousel Kids introduced evidence to support the erroneous legal tests.” Rcp.Br. at 2. However, as discussed infra, we do consider the district court's application of the law to the facts in order to discern whether the district court adopted the correct legal standard.
. "Copying" is regularly used as a shorthand to refer to the infringement of a copyright holder’s exclusive rights under a copyright.
Gates Rubber Co.
v.
Bando Chem. Indus., Ltd.,
. Defendants briefly argue that Plaintiff was not validly assigned the copyrights at issue, and thus, cannot sue for infringement. However, because the district court did not rule on this issue below, we do not consider it on appeal.
. While the basic inquiry looks to whether the allegedly copied work is "substantially” similar to the original work,
Autoskill,
. The "abstraction-filtration-comparison” test, or the "successive filtration” test, was developed for use in the context of alleged infringement of computer software, and it is exclusively in that context that we have previously applied the test.
See, e.g., Gates Rubber,
. The relevant casclaw addresses this theme at length.
See Sony Corp. of Am. v. Universal City Studios, Inc.,
. This concept, applied here to the copyrightability of dolls, relates to the
scenes a /aire
approach employed in the literary context. This approach examines “incidents, characters or settings which arc as a practical matter indispensable, or at least standard, in the treatment of a given topic [to determine which] stock literary devices arc not protectible by copyright.”
Atari,
. The district court's order stated that “[t]hc expression that is entitled to copyright protection is the hair, eyes, nose, cars, mouth, underwear and shoes of the dolls." We decline to pass upon this statement because that issue has not been raised on this appeal.
. Wc have previously reserved this issue as an open question.
See Autosldll,
.
See, e.g., Concrete Mach. Co.,
. Plaintiffs also contend that the district court erred in requiring a finding that the infringement would lead to a threat of bankruptcy. Defendants respond that the district court's finding that "[t]hc evidence is not at all persuasive that Plaintiff is in danger of going broke because of Defendant’s efforts," Aplt.App. at 185, was premised on Plaintiff's theory of the case. We do not address that issue on this appeal. However, wo do note that the legal standard of irreparable injury can be satisfied through a showing lesser than the threat of bankruptcy.
See, e.g., Autos-kill,
