Definitions for "Express consent"
For the purposes of PIPEDA, express consent means that verbal or written permission or authorization has been obtained from the patient for the collection, use or disclosure of his/her own personal health information. Express consent is indisputable.
this is needed to display an advertisement, which does not benefit from deemed consent under the Town and Country Planning (Control of Advertisements Regulations).
Permission that is explicitly sought and applied to the collection, use or disclosure of information, particularly for sensitive information (i.e. health information) or when there has been a significant change from the original purpose for which information was collected. For example, where an organization has a long-standing practice of not sharing its mailing list(s) and has taken the decision to change the practice, seeking express consent is advisable. (See also: opt-in.)