[Discussioni] Un file XORato mantiene il copyright?

[Marco Ferri]

http://monolith.sourceforge.net/


Copyright ==> ?
Things get interesting when you apply Monolith to copyrighted files. For example, munging two copyrighted files will produce a completely new file that, in most cases, contains no information from either file. In other words, the resulting Mono file is not "owned" by the original copyright holders (if owned at all, it would be owned by the person who did the munging). Given that the Mono file can be combined with either of the original, copyrighted files to reconstruct the other copyrighted file, this lack of Mono ownership may be seem hard to believe.

Consider this simple fact: for a given Element file and any other file of the same length (call it fileA), it is possible to choose a Basis file that, when munged with the Element, will produce fileA as the resulting Mono file. Therefore, if a copyright holder claims that she owns the information in all Mono files that are munged from her work, she is also claiming copyright over all possible binary files that are the same length as her work. For example, suppose that fileA is an MP3 of a Beatles song, and the Element file is an MP3 of a Britney Spears song copyrighted by Jive Records. It is possible to find a Basis file that, when munged with the Spears song, will produce the Beatles song as the Mono file. Jive Records certainly cannot claim copyright over the Beatles song (which is copyrighted by Apple Records), nor can they claim copyright over any other Mono files munged from MP3s of their songs.

What does this mean? This means that Mono files can be freely distributed.

So what? Mono files are useless without their corresponding Basis files, right? And the Basis files are copyrighted too, so they cannot be freely distributed, right? There is one more twist to this idea. What happens when we use Basis files that are freely distributable? For example, we could use a Basis file that is in the public domain or one that is licensed for free distribution. Now we are getting somewhere.

None of the aforementioned properties of Mono files change when we use freely distributable Basis files, since the same arguments hold. Mono files are still not copyrighted by the people who hold the copyrights over the corresponding Element files. Now we can freely distribute Mono files and Basis files.

Interesting? Not really. But what you can do with these files, in the privacy of your own home, might be interesting, depending on your proclivities. For example, you can use the Mono files and the Basis files to reconstruct the Element files. 
-------------- parte successiva --------------
Un allegato HTML è stato rimosso...
URL: <http://lists.softwarelibero.it/pipermail/discussioni/attachments/20040809/8f7161c3/attachment.html>