participate in the Partner Program to make a book available for preview or full view, in which case it would share revenue derived from the display of pages from the work in response to user queries. It can let Google scan the book under the Library Project and display snippets in response to user queries. It can opt out of the Library Project, in which case Google will not scan the book. If the book has already been scanned, Google will reset its access level as 'No preview'. Most scanned works are no longer in print or commercially available. In addition to procuring books from libraries, Google also obtains books from its publisher partners, through the "Partner Program" – designed to help publishers and authors promote their books. Publishers and authors submit either a digital copy of their book in EPUB or PDF format, or a print copy to Google, which is made available on Google Books for preview. The publisher can control the percentage of the book available for preview, with the minimum being 20%. They can also choose to make the book fully viewable, and even allow users to download a PDF copy. Books can also be made available for sale on Google Play. Unlike the Library Project, this does not raise any copyright concerns as it is conducted pursuant to an agreement with the publisher. The publisher can choose to withdraw from the agreement at any time. For many books, Google Books displays the original page numbers. However, Tim Parks, writing in The New York Review of Books in 2014, noted that Google had stopped providing page numbers for many recent publications (likely the ones acquired through the Partner Program) "presumably in alliance with the publishers, in order to force those of us who need to prepare footnotes to buy paper editions." Scanning of books The project began in 2002 under the codename Project Ocean. Google co-founder Larry Page had always had an interest in digitizing books. When he and Marissa Mayer began experimenting with book scanning in 2002, it took 40 minutes for them to digitize a 300-page book. But soon after the technology had been developed to the extent that scanning operators could scan up to 6000 pages an hour. Google established designated scanning centers to which books were transported by trucks. The stations could digitize at the rate of 1,000 pages per hour. The