” The following principles are essential to preserve a meaningful understanding of the Public Domain and to ensure that the Public Domain continues to function in the technological environment of the networked information society. With regard to the structural Public Domain these are as follows:

1. The Public Domain is the rule, copyright protection is the exception. Since copyright protection is granted only with respect to original forms of expression, the vast majority of data, information and ideas produced worldwide at any given time belongs to the Public Domain. In addition to information that is not eligible for protection, the Public Domain is enlarged every year by works whose term of protection expires. The combined application of the requirements for protection and the limited duration of the copyright protection contribute to the wealth of the Public Domain so as to ensure access to our shared culture and knowledge.
2. Copyright protection should last only as long as necessary to achieve a reasonable compromise between protecting and rewarding the author for his intellectual labour and safeguarding the public interest in the dissemination of culture and knowledge. From neither the perspective of the author nor the general public do any valid arguments exist (whether historical, economic, social or otherwise) in support of an exceedingly long term of copyright protection. While the author should be able to reap the fruits of his intellectual labour, the general public should not be deprived for an overly long period of time of the benefits of freely using those works.
3. What is in the Public Domain must remain in the Public Domain. Exclusive control over Public Domain works must not be reestablished by claiming exclusive rights in technical reproductions of the works, or using technical protection measures to limit access to technical reproductions of such works.
4. The lawful user of a digital copy of a Public Domain work should be free to (re-)use, copy and modify such work. The Public Domain status of a work does not necessarily mean that it must be made accessible to the public. The owners of physical works that are in the Public Domain are free to restrict access to such works. However once access to a work has been granted then there ought not be legal restrictions on the re-use, modification or reproduction of these works.
5. Contracts or technical protection measures that restrict access to and re-use of Public Domain works must not be enforced. The Public Domain status of a work guarantees the right to re-use, modify and reproduce. This also includes user prerogatives arising from exceptions and limitations, fair use and fair dealing, ensuring that these cannot be limited by contractual or technological means….”