A more thorough explanation:

Term: de temps dont memorie ne court
Definition: This is a Law French phrase that means "time out of human memory." It refers to a time period that is so long ago that no one can remember it. This phrase was used in the past to describe a time period that was so old that no one could provide evidence or testimony about it in a legal case.
Example: The law stated that the property rights of the landowner could not be challenged because they had been in possession of the land "de temps dont memorie ne court." This means that the land had been in the possession of the landowner for so long that no one could remember a time when it was owned by someone else. This phrase was used to protect the rights of long-time landowners.