DOCDB is the EPO's master documentation database with worldwide coverage. It contains bibliographic data, abstracts, citations and the DOCDB simple patent family. DOCDB data is the backbone of Depatisnet and Espacenet products and services. It includes bibliographic data from over 90 countries worldwide. The data goes back as far as the 1830s for some patent authorities,
It also contains CPC classes and IPC classes, which are added during the examination procedure at the various offices.The database is updated twice a week and uploaded to the patent database by IamIP and serves as the basis for loading further full texts and images and for adding links to the PDFs and for creating the IamIP patent database.
Detailed information about the database of the database can be found here.