Turning to the third factor, the amount and substantiality of the portion used in relation to the copyrighted work as a whole, EFF admitted that because the Apple firmware is necessary in order to operate the iPhone, it is necessary for individuals who jailbreak their phones to reuse the vast majority of the original firmware. However, the amount of the copyrighted work modified in a typical jailbreaking scenario is fewer than 50 bytes of code out of more than 8 million bytes, or approximately 1/160,000 of the copyrighted work as a whole. Where the alleged infringement consists of the making of an unauthorized derivative work, and the only modifications are so de minimis, the fact that iPhone users are using almost the entire iPhone firmware for the purpose for which it was provided to them by Apple undermines the significance of this factor. While the third factor arguably disfavors a fair use finding, the weight to be given to it under the circumstances is slight.