You would have to turn authentication off to allow guests and your blue-ray player to access the internet. To maintain your security, you can turn authentication off when you need to then turn if back on. Here are the steps to turn if off:
1. Open Routing and Remote Access in administrative tools
2. Right click on your server and click Properties
3. In the security tab, click on Authentication Methods
4. In Unauthenticated Access, select Allow Remote Systems to Connect Without Authentication.