Robert Hettinga writes:
If it's encrypted, and it's on my hard drive, than it's my property. I own it, not someone else. That's a private good. I can turn around, and sell it to you. You can encrypt it, and put it on your hard drive, and you can sell it. It's *your* property.
This has nothing to do with the definition of public versus private goods, which was quoted in the message to which you replied. Public goods are non-rival and non-excludable, terms which were defined there. Do you understand what these words mean? Can you use them in a sentence that begins, "Digitally signed information is not a public good because..."?
In the meantime, read my .sig, below, and take it to heart. ... "Externalities are the last refuge of the derigistes." -- Friedrich Hayek
Right, I'll do that as soon as you learn to spell dirigistes. There's nothing like using French incorrectly to show someone up as a pretentious jackass.