You absolutely must be careful moving content from one virtual world to another, however. If you haven't been given written permission at the time of purchase (license) to copy content to another grid, you are in violation of the license (and the law).
At no point during the purchase of Intellectual Property do you ever own that property. You only purchase a license to use it. You do not gain any usage rights beyond what is explicitly detailed in the license.
This includes content you create with the licensed content in question. If you want to use content purchased from another creator in a product you intend to sell, you must ensure your license includes the ability to create derivative works, the ability to duplicate the work (even if used in a derivative work), the ability to distribute the work, and the ability to use the work for commercial gain. Without those terms explicitly detailed in the license, the content in question cannot be used for your product."
I don't think I have to tell many of you what is wrong with this comment which was made to one of my posts. Obviously the commenter (and those who agree with him/her) DO need a refresher of the true spirit of copyright, which is what protects your intellectual property rights.
Let me give you three examples which apply directly to the begged question:
(1) I buy a print or painting from Boris Vallejo. I hang that print or painting on my wall. In addition, I scan it into a texture file on my computer, and I use it on my website. Later on, I decide to sell the painting or print; however, I still represent it as Mr. Vallejo's work and not my own. I am allowed to sell it to whomever I wish without asking Mr. Vallejo's permission.
(2) I purchase a crochet pattern from one of the many sites on the Internet which sells them. This is a digitized product. I can "build" a line drawing of the doily it would create, I can tint it, texture it, and keep it digitized - and I can do whatever I wish with that "build" without any further "permission" from the pattern creator - as long as I don't try to resell the actual pattern as my own. I can also "build" the doily in real life and sell copies of it, or sell pictures of my work, without any further "permission" from the pattern creator.
(3) I purchase an example of custom, one-of-a-kind stained glass from someone. I photograph this stained glass, and I use it in one of my 3D builds, without any further "permission" from the creator. I mount this stained glass in my home, which happens to be a mobile home. Later on, I decide to sell my mobile home, and the installed stained glass with it, and the buyer moves the home to another state entirely - or even another country. Nobody, not me nor the buyer, are under any legal obligation to inform the creator that their piece has been photographed or sold or moved. What we are NOT allowed to do is attempt to sell the stained glass piece as our own work.
Now, do you understand? Your rights in a 3D atmosphere are no different. We, as the builders who buy your products, are under no obligation to ask your permission to move OUR finished product wherever we wish - as long as we do not attempt to sell YOUR product, by itself, as our own.
Any further restrictions you attempt to put upon how we use your materials are bogus. If you think you can charge us money for moving our completed work wherever we wish on the Internet, you have another think coming. You have no more right to do this than Mr. Vallejo, the crochet pattern maker, or the stained glass maker. If you won't make a sale without trying to get us to agree to a bunch of bogus restrictions, we won't buy your products. It's as simple as that.
NOW I will NOT entertain more comments of this sort without hard evidence to back them up.