718 ITU‐T's Technical Reports and Specifications 7 Use cases Some use cases of open data are introduced in this Section. As mentioned previously, open data are defined as the idea that the data are available for anyone can use for any purpose at no cost. Additionally, open data do not request users any management protocols such as copyrights, patents for reusing and republishing. \"Open Knowledge Definition\" is well‐known definitions how the data can be said as open data. Table 3 shows 10 definitions of open data56. These definitions were created for smooth data use in this information society. Table 3 – Open Knowledge Definition 1 Access \"Access\" indicates that available as a whole as and at no more than a reasonable reproduction cost, preferably downloading via the Internet without charge. The work must also be available in a convenient and modifiable form. 2 Redistribution \"Redistribution\" indicates that open access do not restrict any party from selling or giving away the work either on its own or as part of a package made from works from many different sources. The license shall not require a royalty or other fee for such sale or distribution. 3 Reuse \"Reuse\" indicates that open data allow for modifications and derivative works and must allow them to be distributed under the terms of the original work. 4 Absence of technological restriction \"Absence of technological restriction\" indicates that open access providers in such a form that there are no technological obstacles to the performance of the above activities. This can be achieved by the provision of the work in an open data format, i.e., one whose specification is publicly and freely available and which places no restrictions monetary or otherwise upon its use. ____________________ 56 Open Definition, URL: http://opendefinition.org/od/#sthash.PmqzjbQW.dpuf (2014).