You can use SatoshiPay to purchase articles, pictures, audio files, videos, or any other types of downloadable files which are sold with SatoshiPay on a website.
What exactly you purchase, how long you have access to the content, etc. depends on the purchase agreement between you and the publisher. In general, you pay for the right to gain access to a piece of digital content. But how long the access right lasts, whether you can download the content for future use, etc. depends on the agreement between you and the publisher.
In many cases, you can download the content you have purchased directly so that you can keep it on your computer. Click here for more instruction on purchasing and downloading the content.