It's not de facto "theirs", but something we proposed to keep them off our back and they did not object to.
Depending on the publisher, and whether that publisher is an ESA member or a subsidiary thereof, the protection is either 15 or 10 years. There are a few exceptions to the rule, with extended or unlimited protection periods.
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"God. Can't you people see I'm trying to commit a crime against science and nature here?"
-- Reed Richards
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