以下观点来自：
http://venomousporridge.com/post/16126436616/ibooks-author-eula-audacityiBooks Author的用户协议有点狠：
IMPORTANT NOTE:
If you charge a fee for any book or other work you generate using this software (a “Work”), you may only sell or distribute such Work through Apple (e.g., through the iBookstore) and such distribution will be subject to a separate agreement with Apple.
B. Distribution of your Work. As a condition of this License and provided you are in compliance with its terms, your Work may be distributed as follows:
(i) if your Work is provided for free (at no charge), you may distribute the Work by any available means;
(ii) if your Work is provided for a fee (including as part of any subscription-based product or service), you may only distribute the Work through Apple and such distribution is subject to the following limitations and conditions: (a) you will be required to enter into a separate written agreement with Apple (or an Apple affiliate or subsidiary) before any commercial distribution of your Work may take place; and (b) Apple may determine for any reason and in its sole discretion not to select your Work for distribution.
简体中文的这部分翻译如下：（可以在iBooks Author->关于->许可协议 里找到pdf文档）
B. 阁下作品的分发。作为本许可证一个条件,并且在阁下须遵守其条款的情况下,阁下的作品可 通过以下方式分发:
(i) 如阁下免费提供作品(不收任何费用),阁下可通过任何可用的手段分发作品;
(ii) 如阁下收费提供作品(包括作为任何订购产品或服务一部分),阁下仅可通过Apple分发作 品,并须受到以下分发限制和条件规限:(a)在阁下作品可作任何商业性分发之前,阁下须与 Apple(或Apple子公司或附属公司)另行订立书面协议;及(b)Apple可基于任何理由自行决定不 选取阁下的作品分发。
对于阁下因使用本Apple软件可能招致的任何成本、开支、损害赔偿、损失(包括但不限于失去商 机或利润损失)或其他负债,包括但不限于阁下的作品未能获得Apple选取分发,Apple概不负 责。
就是说，如果用author编辑出版个人作品，就要和apple签独占协议了。
如果要打比方的话，就好比用photoshop编辑图片，adobe要抽一笔版权费一样荒谬了。