The reason for creating this lens is purely educational. As you might know there are many services in the internet that allow you to upload designs and have them printed on t-shirts and other merchandize. You can then buy these products for yourself or even sell them to other people for a profit. One can find many sites that are promoting such services; the most popular are Cafepress, Zazzle and Spreadshirt.
Occasionally when you try to upload a design you might get a note that your design is violating someone else's trademark, copyright or it is plain unacceptable for some other reason. Basically this is called red flagging of you design. These companies have the right to do so since this way the protect themselves and you form possible lawsuits and other unpleasant encounters with lawyers. Many times this banning has nothing to do with the design itself but everything with the text that they ask you to accompany the design and describe the design. Such text if it leads to sales can also be considered a violation of a trademark.
During the last few months with one of these services I have a number of designs banned. As I said these companies have the right to "de facto" red flag a design so in many cases I don't know the real reasons of the banning and if there has been a violation of a trademark, if such violation will hold in a court or if there was a violation at all and the design was banned for other reasons.  
Most of my banned designs are parodies, something that it is acceptable under the law but still doesn't help since even in a parody case someone can sue an artist for his work and the issue will have to be resolved in court.

This is a list of my banned designs that you can't purchase. If you are interested to see my other designs please visti my site. There are more than 350 designs available in a number of products,

This list will update when a design gets banned at Cafepress.