https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/11221836Edit ImageSaveSaveEditCropCustom TextSecurity motivational poster (1950-1969) chromolithograph by NSA. Original public domain image from Wikipedia. Digitally enhanced by rawpixel.Original public domain image from Wikimedia CommonsMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGTIFFSmall JPEG 933 x 1200 px | 300 dpiLarge JPEG 2229 x 2868 px | 300 dpiTIFF 2229 x 2868 px | 300 dpi | 36.62 MBFree DownloadSecurity motivational poster (1950-1969) chromolithograph by NSA. Original public domain image from Wikipedia. Digitally enhanced by rawpixel.More