Every file has metadata incorporated into them. Camera settings, date, time, GPS (in newer cameras equipped with that information), creator's information and copyright restrictions.
There are several ways to review the metadata.
In Photoshop: Open a file and click on File in the top left tool bar.
In Adobe Bridge: Right click on a file.
In Adobe Lightroom: Go to the Library Module
Web based tools:
If you do not have any of the Adobe tools/applications you can also go to http://metapicz.com/#landing. Drop an image onto the web site as shown below.
I hope this helps. FYI, using images without proper permission can lead to expensive litigation and fines. Next month I plan to discuss keywords.