You cannot prove a negative* so the best you can do to demonstrate compliance is that you can honestly say "all reasonable and proportionate searches of our systems fail to detect any** identifiable personal data relating to X" * well in fact you can as a philosophical or logical proposition but not realistically in this context as you would have to hand over every single bit of data you hold ** or replace 'any' with a description of the data you were asked to erase. ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ All archives of messages are stored permanently and are available to the world wide web community at large at http://www.jiscmail.ac.uk/lists/data-protection.html If you wish to leave this list please send the command leave data-protection to [log in to unmask] All user commands can be found at https://www.jiscmail.ac.uk/help/subscribers/subscribercommands.html Any queries about sending or receiving messages please send to the list owner [log in to unmask] Full help Desk - please email [log in to unmask] describing your needs To receive these emails in HTML format send the command: SET data-protection HTML to [log in to unmask] (all commands go to [log in to unmask] not the list please) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^