answer:If you’re talking about the art you create for the phone case: “Your work is under copyright protection the moment it is created and fixed in a tangible form that it is perceptible either directly or with the aid of a machine or device” (copyright.gov faq). More detail/legalese: § 102 . Subject matter of copyright: In general28 (a) Copyright protection subsists, in accordance with this title, in original works of authorship fixed in any tangible medium of expression, now known or later developed, from which they can be perceived, reproduced, or otherwise communicated, either directly or with the aid of a machine or device. Works of authorship include the following categories: (1) literary works; (2) musical works, including any accompanying words; (3) dramatic works, including any accompanying music; (4) pantomimes and choreographic works; (5) pictorial, graphic, and sculptural works; (6) motion pictures and other audiovisual works; (7) sound recordings; and (8) architectural works. (b) In 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. (copyright.gov, copyright law chapter 1) That’s not to say that people don’t infringe on copyright all the time—and if you’re serious about keeping ownership of the work you might have to get your lawyers involved to bring actions against people violating your copyright. If you’re wanting to trademark a logo for yourself, then I think you do need to go through some legal steps to get that, but I’m not sure on how that works. I haven’t created anything like this, so I can’t tell you much else. Probably someone else can! Best of luck!