Le 13 mars 10 à 03:45, Kragen Javier Sitaker a écrit :
> In order for this to work, though, there needs to be a record of these
> things having been published at a particular time; things published
> after a patent application has been filed are not "prior art" and  
> do not
> invalidate patent claims.

A long time ago there was someone (ex-Bell?) who was offering a  
timestamping service; IIRC documents and metadata were securely  
hashed, and these hashes then hashed, until finally the daily root  
hash was published as a classified ad in the New York Times (yes,  
back when newspapers existed and still printed classified ads :-)

-Dave