The R4 allows easy software piracy by fitting right into the DS's cartridge slot. Data is stored on a Micro SD and downloaded from websites via a flash drive, and the R4 has a small slot that the Micro SD card goes into. In a statement released today, Nintendo announced that these R4 devices "allow illegal uploading from the internet", adding that "it is causing severe damage to our company and software makers, and this is something that we cannot possibly overlook." In conclusion, Nintendo adds that such devices hurts the growth of the entire game industry and steps must be taken regarding the legality of R4 carts. It's important to note that this legal injunction is for Japan only.