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It is part of the standard way of finishing a press release. Some of these formal documents still use these conventions. It comes, I think, from the time when press releases came on a teleprinter,...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/5631 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
It is part of the standard way of finishing a press release. Some of these formal documents still use these conventions. It comes, I think, from the time when press releases came on a teleprinter, and it was important to mark the end, so that it was clear to the recipient that the entire release had been received.