Apple's reluctance to hand over subscriber data is a major obstacle to getting magazine publishers on to the iBookstore and the iPad, according to claims by media executives talking to Apple. Where publishers are used to getting age and other demographic info, sources for FT say that Apple's traditional iTunes model only provides sales numbers, cutting publishers off from one of their most trusted outlets for information. The model could not only make it difficult to target ads at a given audience but could prevent incentives for print subscribers, such as giving th
