How to detect if an MPMediaItem represents a DRM-protected audio track on iOS

Question

I would like to know if an MPMediaItem that represents a music track is for a Fairplay/DRM-protected item. Any way to do this?

Answer 1

Justin Kents' solution works great. I recommend using blocks though or else the UX will suffer if you deal with a bunch of songs:

-(void)checkDRMprotectionForItem:(MPMediaItem*)item OnCompletion:(void (^)(BOOL drmProtected))completionBlock
{
    dispatch_async(_drmCheckQueue, ^{
        BOOL drmStatus;
        NSURL* assetURL = [item valueForProperty:MPMediaItemPropertyAssetURL];
        if (!assetURL) {
            drmStatus = YES;
        }

        dispatch_async(dispatch_get_main_queue(), ^{
            if (completionBlock) {
                completionBlock(drmStatus);
            }
    });
    });
}