On Fri, 22 May 2020 at 16:41, Bob Goodwin <bobgoodwin@fastmail.us> wrote:
I have a set of instructional DVDs the I am asked to copy to thumb USB
drive. 

Commercial instructional DVDs often have copy protection or some "pay per view"
mechanism.   My former work regularly provided instructional DVD's that could 
not be copied.  The software kept a log of the user's progress on the system disk 
and created a certificate file to print on completion, but in some cases we had to 
have the DVD inserted to use the course.
 
Can it be done with Fedora 31, the computer with a DVD drive and
if possible what is the best program to use. They are made for a Windows
computer and of course will not function in Linux. I can see the files
and run videos etc but the  lessons will not run in my Linux computer.

I tried k3b but it did not even see the disk?

I keep a few commercial DVD's produced by ESA and NASA that
are not copy protected to test DVD readers and software.   
 
Anyway what can I do to put them on a 64 GB flash drive?

Assuming the DVD doesn't reboot into PC-DOS or the like,

Plan A: straight copy to the USB key and see if it is usable. 

Plan B:  Windows 10 can loop mount some .iso image files, so 
make ISO image file of DVD using dd and see if works in Windows.   
 
Plan C: use the ISO image file to make a "clone" of the DVD.

--
George N. White III