Note that you could make up a hash and use it as an encryption key for something (which is unrelated to whatever it is the hash of). It is also possible to use

Note that you could make up a hash and use it as an encryption key for something (which is unrelated to whatever it is the hash of). It is also possible to use a hash as the encryption key for the data that it is a hash of. It is not too difficult to make up data that the first few bits of the hash match some specific number (although it is a bit slow). For example, you can adjust values of pixels in a picture so that if you make the hash of each scanline independently and then put together the first few bits of the hash of each scanline then it will make up some specific text. Or, to collide the first few bits of a commit (or a file) of a git or fossil repository. You can also do many things involving XOR of hashes with other data (whether you have two or possibly more than two sets of data), etc. But, copyright is bad anyways, and laws that you cannot freedom of speech (e.g. to tell you if you hate or don't hate the queen), is also bad anyways.