To ensure that the licensee can fully exercise the rights granted by the licensing terms, the copyright holder has the obligation to keep the work in question in a usable state. For example, the terms may ensure that the source code of the work will be open, and this is the responsibility of the licensor to keep the work in such state. In addition, the licensor bears certain responsibility under some conditions to the damaged caused by the use or the inability to use the work. Under certain conditions the licensor also bears the responsibility of possible copyright infringement. In terms of free software, however, as most programs released under such licenses allow other people to reproduce, modify and distribute the original work without compensation or any fee, in order to encourage people to adopt the concept, most licenses include a disclaimer of liability summarized as follows: Unless required otherwise by the related laws or written agreements, the copyright holder or anyone who modifies and distributes the work under the licensing terms will not bear any legal responsibility to any damage caused by the program. In short, the disclaimers simply means the copyright holder does not make a profit from the work, and henceforth there can be no corresponding warranty or responsibilities.