knowledge which the law presumes a person has, even where there is no actual knowledge, e.g. as in the case of documents which have been recorded as a matter of public record
Upon application, trade mark owners are deemed to have constructive notice of all other trade marks currently on the register.
notice of a court action in newspapers that in law is considered to be a sufficient notice to the concerned party or parties
As the summons had been published in an approved newspaper, it was treated as constructive notice.