While it may not be illegal to scrape a web site, it's also not illegal for that site to detect that you're scraping them and limit your ability to do so (for e

While it may not be illegal to scrape a web site, it's also not illegal for that site to detect that you're scraping them and limit your ability to do so (for example, by blocking your IP address). So I wouldn't recommend building a business on such a shaky foundation. Also, republishing copyrighted content is illegal, so it's important to be careful about what is scraped and republished. While facts themselves may not be copyrightable, a presentation of them in a particular form may be.