In the public domain, at least in parts of the world.

Silent Legions Art Pack

"The Silent Legions Art Pack is a free collection of 56 black-and-white line images and one color cover first used in the Silent Legions Lovecraftian horror RPG."

http://www.drivethrurpg.com/product/146840/Silent-Legions-Art-Pack

Collection

Year of Publication 2015

Licensing Public domain (entirety)

Connections

Sine Nomine Publishing (a host of)
Silent Legions (a source of material for)

Genre Horror

Grouping Art, Illustration

Type Graphic (electronic)