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Removal of copyrighted content from the entire Usenet network is a nearly impossible task, due to the rapid propagation between servers and the retention done by each server.[link widoczny dla zalogowanych] Petitioning a Usenet provider for removal only removes it from that one server's retention cache, but not any others. It is possible for a special post cancellation message to be distributed to remove it from all servers, but many providers ignore cancel messages by standard policy, because they can be easily falsified and submitted by anyone.[22][23] For a takedown petition to be most effective across the whole network, it would have to be issued to the origin server to which the content has been posted, but has not yet been propagated to other servers. Removal of the content at this early stage would prevent further propagation, but with modern high speed links, content can be propagated as fast as it arrives, allowing no time for content review and takedown issuance by copyright holders.[24]
Establishing the identity of the person posting illegal content is equally difficult due to the trust-based design of the network. Like SMTP email, servers generally assume the header and origin information in a post is true and accurate.[link widoczny dla zalogowanych] However, as in SMTP email, Usenet post headers are easily falsified so as to obscure the true identity and location of the message source.[25] In this manner, Usenet is significantly different from modern P2P services; most P2P users distributing content are typically immediately identifiable to all other users by their network address, but the origin information for a Usenet posting can be completely obscured and unobtainable once it has propagated past the original server.[26]
Also unlike modern P2P services, the identity of the downloaders is hidden from view. On P2P services a downloader is identifiable to all others by their network address. On Usenet, the downloader connects directly to a server,[link widoczny dla zalogowanych] and only the server knows the address of who is connecting to it. Some Usenet providers do keep usage logs,[link widoczny dla zalogowanych], but not all make this logged information casually available to outside parties such as the RIAA.