I lost access my iTunes library?

A few months ago, I bought a new iPhone and I synced it up to my iTunes library. I have about 300 songs, 30 apps, and 700 pictures. Since then, I bought a new laptop. I attempted to sync my phone to the new laptop, but it says only 1 computer can have my library at once. My old laptop that had my entire laptop has since been sold, and I have no access to it. Is there any way I can remove my library from the old laptop without access to it? I really want to sync my phone to iTunes in case I need to back it up, but it won't let me. Please help me. If I wasn't specific enough feel free to ask any questions. This is really important to me and I don't want to lose all of this data.

I'll help you with that.

At Apple website you can see how to do it.

http://support.apple.com/.../kb/HT2519

You can re-download the songs, apps and so on that you had bought on iTunes Store, App Store or Book Store.

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