A copyright holder may grant other people rights to use his or her own work. As for where and when the work can be used, how it can be used, or the details of such use, these will be agreed upon by the two parties. Anything that is left out of the agreement is regarded as rights not granted by the copyright holder. A copyright holder’s economic rights include rights to reproduce, to express verbally in public, to broadcast, to play on screen, to perform in public, to display, to edit, to modify, and to lease. The copyright holder can grant specific rights to different licensees using licensing terms. Multiple license henceforth is defined as such that the copyright holder sets up different licensing terms for different licensees, regardless if such act is taken at the same time or in a different order of time. In terms of open source software, the copyright holder sets up a given set of licensing terms to the general public regulating the rights granted. In its nature, however, the license is still a legal act between the licensor and some certain licensees. As a copyright holder can have different licensing terms for the same work, if a person needs different ways of using the work, he or she can contact with the copyright holder for a different set of licensing terms.