iBookstore and iPad talks between Apple and magazine and newspapers are continuing, but insider sources warn of philosophical hurdles to clinching a deal, the Financial Times reports.The discussions with Apple are characterised as “friendly” and in early stages, but issues to finally clinching deals include such matters as subscription revenue sharing and control - and indeed, access too - the kind of deep subscribed information newspapers and magazines build their businesses upon.Essentially, the report explains one sticking point is the dearth of data Apple shares with those selling content through its servces, prompting “one senior exec from a major US metropolitan daily” to describe that lack