The Full Form of TDO is Tobacco Documents Online.

The UCSF Truth Tobacco Industry Documents is a digital archive of tobacco industry documents, funded by Truth Initiative and created and maintained by the University of California, San Francisco. The Library is a part of the larger UCSF Industry Documents Library which also includes the Drug Industry Document Archive, the Food Industry Documents Archive and the Chemical Industry Documents Archive. TTID contains over 14 million documents produced by major tobacco companies and organizations, many of them internal strategic memoranda made public as a consequence of the Tobacco Master Settlement Agreement. The documents deal with the tobacco industry’s advertising, manufacturing, marketing, sales, and scientific research activities for the last century. Researchers, journalists, students, and activists interested in tobacco control issues and public health policies use the Library extensively to investigate tobacco industry strategies. Research in this archive revealed the tobacco industry playbook and its parallels with techniques linked to climate change denial.