For example, if you give away or sell a book, you don't have it anymore. But if you give away or sell an e-book, you still retain the resource you have sold or given away.
You could think of this more abstract, too. For example, if you're an artist, you can "give away" your skills by making a drawing for someone and you have not lost your skills. However you can't get back the time it took to make the drawing, so your time is given away without you being able to retain it.
More poetically, love is something you can give away and you still have just as much to give.
Is there a word for this type of resource?