Hi Mike et al,
Three things I'd add to David Deer's post, which is spot on legally.
(1) Copyright infringement can be really expensive. For example, Getty Images claim $20,000 PER IMAGE and are likely to win such damages in an American court. At that rate, the solicitor was making more than you, Mike !
(2) Most stock image sites (like Getty) use reverse image search engines which crawl the World Wide Web to detect their own images and detect copyright infringement. They're pretty good at finding images like the ones on their site even if it's been photoshopped. There's a publicly available site called
https://www.tineye.com/, which will check the web for any image you upload.
(3) If your website designer is providing images for your site, make sure he/she gets them legally, and to show him/her you mean it, insist that he/she indemnifies you for copyright infringement for those images.
The open source movement has invented a licence known as Creative Commons which allows the use of copyright material under certain conditions, usually this means crediting the copyright owner. You'll find lots of these on sites like Flickr.com. Crediting copyright owners can be a pain if you use more than half a dozen images, so you can also use other sites which are copyright free such as pixabay.com. Google Images search engine allows you to search for images without copyright restrictions, but the copyright still needs checking!
Finally all US government pictures are public domain, so good images are widely available for many subjects eg space
, but not carpet cleaning
HTH
James