Ever Heard of Tell-Ware Agreement!

Shareware, freeware, abandon ware, donation ware and now there's a new ware and its called tell ware. 

Daz3D have made an agreement and they make you accept the so called "tell-ware" agreement before you can use their software, it's interesting as well as innovative!:

"I Agree to tell at least two people about DAZ Studio and/or www.DAZ3D.com that are not already aware of DAZ 3D.
What is Tell-Ware?
DAZ 3D has a made a commitment to keep the DAZ Studio core application FREE to the public for as long as possible. In order for this to be possible, DAZ 3D relies on the revenues generated by the purchase of content and advanced versions of DAZ Studio that are available in the DAZ 3D online store. The more people that purchase regularly from DAZ 3D, the more that development of DAZ Studio can be subsidized and the longer that the core version of DAZ Studio will remain free. For this reason, we ask that you agree to tell at least two other people about DAZ Studio and/or the DAZ 3D website that don't already know about www.DAZ3D.com. With your help, we can continue to offer a free version of DAZ Studio indefinitely.
The power of a single individual can be substantial. Great things can come to pass as a result of the power and good faith of a single person. By joining together, each one of us can help insure a bright future for this 3D community. DAZ 3D strongly believes that by simply telling a friend or two about DAZ Studio and what can be done by combining this free program with any of the thousands of pieces of digital content available, the growth of the community can become exponential.
You CAN make a difference!"