I want to give a USB flash drive to a friend but I don't want him to copy the data in USB or add anything to it is it possible so he could only read the files without the ability to do anything else?
Your goal is to "Prevent data on Flash drive to be copied"
One way is to use third party software likes
Now the above will require you purchasing those software. so not sure about budget or how critical the data is
If you goal is simply secure these file
one alternative zip these files and password protect them, Again this is not what you asked.
i use 7zip and then just password protect my files