I'm the web developer at Audio Reader which is a service for blind and print disabled folks. What we do is we read newspapers, magazines and books and broadcast them over a special FM frequency given to us by the FCC that only special radios can get. We then give those radios to people who can't read.
We also have an online stream ( http://reader.ku.edu/listen ). But because much of the material is copyrighted, we can't just let anybody listen to it, so there's a simple prompt "Are you blind or print disabled? Yes or no." There's more words than that of course, but you get the idea. It also says that if they're lying then they're the ones responsible for copyright violations and not us. It's not a rock solid legal defense but it works for now.
What I'm trying to do is build an Alexa skill that allows these folks to say "Alexa, play Audio Reader" and then our online stream plays on echo devices. I'll need to have the same prompt to make sure there's no copyright violations.
But before I go any further, it occurred to me that it might be wise to make sure that this isn't going against any Terms of Service agreement with Amazon.