Open Data is easily machine-readable data that are freely accessible on the Internet. Anyone can access Open Data and use them for arbitrary (legal) purposes.
Open Data must be primarily
1. Accessible like data files in machine-readable and open format with complete and up-to-date database content or aggregated statistics
2. Subject to unrestricted conditions of use
3. Administered in the National Open Data Catalogue (NKOD) as direct links on data files
4. Attached with documentation/ be documented
5. Available for download without technical barriers (registration, access restrictions, CAPTCHA, etc.)
6. Prepared with the aim for the easiest machine processing for programmers etc.
7. Attached by contact of the curator for feedback (errors, request for extension, etc.)
If your datasets don’t meet one of the conditions, it is not Open Data. Open Data doesn’t include:
1. Search form designed for end-users
2. Website with additional information
3. Public GIS Map Interface
4. Web service accessing individual records forming data set with a limitation access
5. Dataset in the PDF format
6. Dataset in XLS format (formatted for printing)
7. Dataset in pseudo CSV format (e.g. other separator than….)
When determining datasets, note that the open data does not only relate to data transparency but to all areas of public administration.
Source: Open Data CZ