When running a small business or organization you have to be very careful when adding content to your website. You should know exactly, what you are allowed to publish and what not, to make sure you avoid plagiarism or copyright infringement.
All work published is copyrighted - this is true for most countries (certainely for the USA and Germany)! This means, you have to ask for permission to use it - whether there is a copyright notice or not. Never take credit for someone else's work and let viewers know, whose work it acutally is.