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- > As for charging, fairness requires that the link not be activated
- > until I have seen a warning (otherwise I might get charged a zillion
- > dollars to read the document - just like 900 phone numbers in the
- > USA). So this will add complexity to the client.
-
- This is of course very important! But just adding an alert in the
- client before spending money is not a complex change. It might just be
- annoying to the user (had you rather be annoyed or spend $$$ ?) The
- user could also want to authorize access without warning to trusted
- data sources, e.g. a pay-by-time database that he uses frequently
- (with the stress of the ticking $ clock in the corner...)
-
- > Also, attention links are not sufficient for a charging. They
- > support a model where I am charged once per read, no matter how much
- > of the document I read. But it seems likely that there might be need
- > for other charging models.
-
- For a discussion of the many problems of a read-based charging scheme
- (which was to be implemented in Xanadu as an answer to the Copyright
- issues), you may want to read a paper presented at the Hypertext'91
- conference in San Antonio, by Pamela Samuelson and Robert Glushko,
- "Intellectual Property Rights for Digital Library and Hypertext
- Publishing Systems: an Analysis of Xanadu" (unfortunately not
- available online to my knowledge...)
-
-