Originally Posted by sirmaru
If I did that, would my Sony 3.1 PC software and my PRS 900 be able to read it?
Yes. The only thing to be sure about is that your copy of Desktop Adobe Digital Editions is using the same AdobeID as your Sony. One way to check is to confirm that ADE can read one of your Sony ePubs. This matters because 3rd party ePubs are typically downloaded by Desktop ADE.