not only that, but it would instantly turn everyone who owns a hard
drive or a CD-ROM into a copyright violator: the disks checksums the
content of the disk _in a reversible way_. Same for RAID5 and RAID6
techniques. By installing Quake3 on a Windows box one sure does not have
permission to create a derived work of Windows and Quake3, right? =B-)
a checksum, a one-way hash, or even reversible parity bit(s) that
'mixes' the copies of multiple works together clearly cannot be new work
that falls under copyright protection.
Firstly, it is not a new work, because a 'work' has to be created by a
human - and here the new content was created by a machine. Copyright
protection only applies to sufficiently original works created by
humans.
Secondly, it is _at most_ a new, partial copy of existing works and
hence you need the permission to copy all the works in question. (but
you needed that permission to create the harddisk anyway)
Thirdly, it could be argued that the sha1 is not even a copy, because it
is irreversible and hence not even a single bit of the original work can
be reconstructed from it hence it cannot even be a 'partial copy of the
original'.
that's at least 3 robust levels of argument against the insane and
absurd notion that the SHA1 key is somehow a derived work of the copy it
checksums.
Ingo
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