Are the PTR records for IP addresses copyrighted by anyone? For example, WHOIS data is copyrighted by ARIN and other regional registries (http://www.ripe.net/db/support/db-terms-conditions.html). WHOIS data is different than rDNS data, I'm wondering about the rDNS data specifically...
closed as off topic by Zoredache, John Gardeniers, womble, Sam, squillman Nov 5 '09 at 16:56
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IANAL, but I suspect that copyright could not be applied to a specific record any more than you can copyright a phone number, or an address.
As I understand it, in the US, usually you can not copyright individual facts, but you can copyright a database of facts if the database has some degree of creativity. (Ref)
It is likely that trademarks will cover many of the domain names that are part of a PTR record.
I have no idea why it would matter to you though. If it does you should probably ask a lawyer.