Open data

Open data is data that can be freely used, reused and redistributed by anyone - subject only, at most, to the requirement to attribute and sharealike." Open Data Handbook

Open data often means breaking through restrictive copyright permission, licensing or registration requirements.

Tim Berners-Lee, the inventor of the Web and Linked Data initiator, suggested a 5 star deployment scheme for Open Data:

* Make your stuff available on the Web (whatever format) under an open license.
** Make it available as structured data (e.g., Excel instead of image scan of a table.
*** Use non-proprietary formats (e.g., CSV instead of Excel).
**** Use URIs to identify things, so that people can point at your stuff.
***** Link your data to other data to provide context.

Further reading