you can use this software for registering your PRS-T2 if you want to import DRM Books
https://www.softpedia.com/get/Others...-Library.shtml
if you use Adobe Digital Editions, make sure u you use the same email adress for both ADE and Sony Reader for PC, then you can import the books from ADE onto Sony Reader Software (manually importing from directory) and from there onto PRS-T2.