Paradox bought Prison Architect from Introversion Games, users subject to the installation of a new launcher and a new EULA that gives virtually no ownership rights to modders
Paradox buys Prison Architect:
Paradox Interactive Buys Prison Architect
Paradox's take on Prison Architect
Essentially, Paradox will from now on handle all updates for Prison Architect, and is considering sequels and changes.
With Paradox's "The Slammer" Update, adding new features and nice visual options to the game. But most importantly, this update requires the PDX Launcher on startup, even if you own the game on Steam.
Users of Prison Architect are subject to the Paradox EULA. The mod policy states that any elements of the mod that represent or derive from elements of the game (such as characters, settings, plot, artwork, sound and locations) are owned by Paradox. Additionally, publishing a mod grants Paradox and its affiliates the free right to freely use, distribute, and create works based off of the mod.