What do you say to your coworkers who want to get free copies of your paid (kinda expensive and lots of effort + time to download) work related video tutorials?

Also, sometimes they ask for it indirectly then laugh.
If they insist, should I ask them to pay for the share?

Some people don't like investing in themselves. They pay expensive tuition costs but don't want to invest while they are working.

What's the proper way to say no in a big corporate environment without looking like a bad guy? I will say yes if the justification and initiative are really good.