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On the Web, there are both commercial and free pornography sites.
The bandwidth usage of a pornography site is relatively high, and the income a free site can earn through advertising may not be sufficient to cover the costs of that bandwidth.
These are free websites that post links to commercial sites, providing a sampling of the commercial site in the form of thumbnail images, or in the form of Free Hosted Galleriessamplings of full-sized content provided and hosted by the commercial sites to promote their site.
These files could then be downloaded and then reassembled before being decoded back to an image.
Automated software such as Aub (Assemble Usenet Binaries) allowed the automatic download and assembly of the images from a newsgroup.
Pornographic images had been transmitted over the Internet as ASCII porn but to send images over network needed computers with graphics capability and also higher network bandwidth.
This was possible in the late '80s and early '90s through the use of anonymous FTP servers and through the Gopher protocol.