Amazon has created a new rule limiting the number of books that authors can self-publish on its site to three a day, after an influx of suspected AI-generated material was listed for sale in recent months.

The company announced the new limitations in a post on its Kindle Direct Publishing (KDP) forum on Monday. “While we have not seen a spike in our publishing numbers, in order to help protect against abuse, we are lowering the volume limits we have in place on new title creations,” read the statement. KDP allows authors to self-publish their books and list them for sale on Amazon’s site.

Amazon told the Guardian that the limit is set at three titles, though this number may be adjusted “if needed”. The company confirmed that there was previously no limit to the number of books authors could list a day.