Yes it would be spam, even if these people were opted in to a person somewhere along the way, they are not opted in to you.
These lists circulate around the black hatters like a virus in a day care center. It is not uncommon for someone to have a list addresses that is years old. This is why you get spam in surges, someone is selling a database and made a sale.... next thing ya know you get hammered with more spam and on and on and on.
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"If you shoot for the stars and hit the moon, it's OK. But you've got to shoot for something. A lot of people don't even shoot." - Confucius