"Never to be sold" tag

I was talking to a builder that I know, and she mentioned a desire to be able to mark items or textures so she could give them away, while tagging them as 'never to be resold'. Such items could be copied and/or given away ar zero cost, but could not be sold as-is by subsequent owners for a profit.

The problem would be for some things, such as neat building textures, tagging them in that way might make objects or structures built with them also an un-sellable item.

Can anyone think of a way that textures and the like could be offered for free, could not be resold for profit just as part of some jumble of textures, and yet could still be used as a rational part of a much larger build?

For example, there are a number of texture tiles available on the web that say it's fine to create derivitive works using them, such as 2D and 3D art that uses one of these tiles to texture a wall or a piece of furniture. But legally, those textures are also restricted so they can't be collected and re-sold as part of a texture library.

Any ideas?

Unfortunately, many people just want to make a quick buck. Yes, I sell textures, but I either make them or I make sure that the websites that I get them from have no restrictions attached to them.

Some of the most prolifically used building textures come from a site that specifically states do not sell these, etc. Those textures can be found in freebie boxes - and at a texture store for somewhere around $30L apiece.

I cannot think of any real solution for this. Textures have to have transfer properties if you are going to sell anything you build. They have to have full permissions to show up in texture vendors. They have to be copiable if you need to use them over and over again in a build (or you have to have several copies of said texture)...

Maybe some sort of feature that if original price is set to 0, it can never be changed? I know there are ways around that too.... just brainstorming

Anyone else got any suggestions?