If you have a copy of FileMaker Pro Advanced, i think you can deal it with custom menus.
Tell us if you need more info (but if possible in another section, this one is for bug reports)
Thank you for your post.
"Fred" is correct (Thank you!). If you have FileMaker Pro Advanced, create a Custom Menu that does not include "Export Field Contents" in the Edit menu. This will allow users to play video files, interact with them, but will be unable to export and save locally.
I think you can also set your users up with accounts that use a privilege set that does not allow exporting. This method does not require Filemaker Advanced.