The license notice must be in some way "attached" to each file. (Sec. 1.4.) In cases where putting it in the file is impossible or impractical, that requirement can be fulfilled by putting the notice somewhere that a recipient "would be likely to look for such a notice," such as a LICENSE file in the same directory as the file. (Ex. A.) The license notice is as short as possible (3 lines) to make it easy to put in as many different types of files as possible. While the license permits putting the header somewhere other than the file itself, individual files often end up being distributed on their own, without the rest of the software they were authored with. As a result, putting the license notice in the file is the surest way to ensure that recipients are always notified. For your convenience, Mozilla has produced boilerplate headers formatted with several common 'comment' syntaxes, suitable for copying and pasting.