IMO it is a matter of who wants to use said copyrighted material, for what purpose, and to what end. And not necessarily over some period of time. Two licenses I use.

GNU Public License version 3, GPLv3. Strong copyleft. The right to copy is left to the end user. You can do whatever the hell you want with the code provided you pay forward the four basic freedoms granted to you under the license. I.e. You can view the source code, you can modify the source code, you can distribute the source code, and you can distribute your modifications.

If you do not pay forward the four basic freedoms, you are in violation of the license. This is why google, microsoft, etc. WILL NOT use gplv3 code. They will never grant the four freedoms downstream, and they don't need the legal liability. They have code scanners that look for gplv3 code, and as a developer you use it, they will fire you on the spot. Serious shit.

The second is Creative Commons, CC. There are several variations based on if you can create derivative work, if you can make money off of it, if you need to credit upstream contributors. The one I use is CC-BY-NC-SA. That's you can create derivative works and distribute them provided you: attribute pervious authors i.e. who is it BY, you can't sell it i.e. it is Non Commercial, and since this was shared with you, you must Share Alike.

All that said, these are in a different category than commercial licenses, so restrictions may apply.

Also. "Intellectual property" is bullshit. It's incredibly ambigous and doesn't hold legal value itself. There are three things that do. Copyright, patent, and trademark. Each wrought with their own issues, but the broad concept of intellectual property only exists soley exploit those who don't know better.