I'm going to take your point to the extreme.
It's only open source if the camera that took the picture that is used in the stock image that was used to create the texture is open source.
You used a fully mechanical camera and chemical flash powder? Better publish that design patent and include the chemistry of the flash powder!
Had to look it up myself, it's their name for what Americans call "overtime"
like if you work over 40 hours in a week, any hours you work over 40 are paid out at 150% of your normal rate, some places do 200% for Sunday or holidays.
Found this article from a couple days ago.
https://www.actu.org.au/media-release/1-million-australian-workers-at-risk-of-penalty-rate-cuts-while-bossesare-promised-free-lunches/