Hi Pablo!
Yes, this format is fine for the Sony Reader PRS-505. It's either epub with DRM or pdf with DRM (I couldn't find out which of them it is).
First of all: make sure that you have installed Adobe Digital Editions and that you've authorized it for your Computer and your ebook Reader with the same email-address.
Then, having bought the book, you'll have to Download it from your personal account at the bookstore. Chose "Open with Adobe Digital Editions" when pressing the Download-button. Then ADE will open itself and the book will be downloaded to your ADE-bookshelf.
Having connected your reader with your computer, you can move it via ADE to your reader and afterwards move it with the Sony ebook library into one of your collections if any.
Hope you will make it, sorry for my bad English, greetings from Germany to Argentina,
Momo
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