If the label and content are physically separated, how are they reliably linked to each other? What happens if the content is moved or cached to another site?
A label bureau that stores only labels and not documents associates the labels with URLs. Even if the contents retrieved from that URL are cached, the label bureau can still provide a label describing the URL. If the contents are moved to a new URL, the label bureau may try to keep track of synonyms (alternate URLs that point to the same document) but it may not always keep up. A document that has been labeled at one URL may effectively be unlabeled if it moves to another URL. Q: Does PICS work with communication protocols other than http? In other words, can a PICS compliant software filter be defeated by a user whose access is restricted to documents of a certain label classification, through the user obtaining other documents by FTP or E-mail? A: PICS labels can describe anything that can be named with a URL. That includes FTP and Gopher. E-mail messages do not normally have URLs, but messages from discussion lists that are archived on the Web do have URLs and can thus be labeled. A
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