How do I protect File (read and copy only)

I have created a photo file that I want my kids to be able to see and copy( make an imovie or slideshow with)but not write onto. This way as I update the file with more pictures I can copy the new items over easily without creating copies of pictures. The file size is currently 250GB and to re-write the entire folder each time takes 8 hours and it might only take minutes if it only has to write the new pics. My hope is to be able to drag the file onto their drive and then for the system to ask if I want to replace or ignore existing files and just write the new ones. I want to be the only one that has the capability to do this. Help

If you control their Apple menu -> System Preferences -> Accounts to have parental controls, you can keep that file inside a read only folder that you create for them to access. That's true for nearly every version of Mac OS X.
If you are able to boot into Mac OS 9 on any of your machines, you will have to setup those accounts to boot via Apple -> Control Panels -> Users and Groups to have read only folders.
Secure your account with a password that no one can guess. Birthdays, names, foreign language words are not good passwords. A mixture of consonants, numbers, and symbols are best, and at a minimum 8 characters.

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