Copyright infringement expert witnesses may opine on copyright notice, copyright infringement, and copyright limitations. On their website, the ABA Section of Intellectual Property Law describes the Copyright Act:
It is illegal for anyone to violate any of the rights provided by the copyright code to the owner of copyright. These rights, however, are not unlimited in scope. Sections 107 through 120 of the 1976 Copyright Act establish limitations on these rights. In some cases,
these limitations are specified exemptions from copyright liability. One major limitation is the doctrine of “fair use,” which is given a statutory basis in section 107 of the Act. In other instances, the limitation takes the form of a “compulsory license” under which certain limited uses of copyrighted works are permitted upon payment of specified royalties and compliance with statutory conditions. For further information about the limitations of any of these rights,
consult the copyright code or write to the Copyright Office.