For the Market Place area, it can be for members to sell certain rights to their designs; WR, LR, UR, PR, or even FR.
Wearing Rights (WR)The person buys the rights to wear the design in a signature space or as an avatar, either on a specific place or anywhere.
Learning Rights (LR)The customer/buyer buys the rights to learn from a design you make. For example, a .PSD, .PSPIMAGE, .C4D etc
Using Rights (UR)This is when they can use items they buy in their own pieces, such as C4D's, Illy Swirls, Brushes, Stocks or anything else.
Posting Rights (PR)When they buy the right to post a pack or something on a specific or many forums/sites.
Full Rights (FR)The owner gives up all rights to the buyer. Meaning the original owner will no longer own this, but can do other things with it if they decide to say so, such as CR - Classing Rights (forums that class peopel). Many keep TPR (Team Posting Rights) too, meaning they can post the pack or whatever it is in their Teams' forum/board.
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Not explained very well, but on SI it is, or on somewhere such as PlanetRenders.
It all seems confusing, but it really isn't. It's simple to understand it all. Im on MSN if you need answers etc Christopher!
Yeah bitch that's right, I called you Christopher... deal with it <3