For any of the SlideShowPro Player products and ThumbGrid, no. You may create however many slideshows you need and embed them wherever you like.
With SlideShowPro Director, its license allows you to install the product at a single domain. That one installation of SlideShowPro Director can be used to publish an unlimited number of slideshows, which can be embedded at any web site. The only time you'd need or want additional licenses of SlideShowPro Director is if you needed separate content libraries / user access.
All our downloadable products (all SlideShowPro Player products and ThumbGrid) are offered with both "Single User" and "Corporate" licenses. A Single User license allows you to install and use the product on two computers owned and used exclusively by you (for example, a desktop and laptop computer). A Corporate license can be shared between an unlimited number of employees at a single company / organization; even if the employees work at different physical locations.
Yes, as long as the published SWFs are not embedded as part of a template, application, and/or web site where SWFs are re-sold and/or re-distributed for independent use by third parties.
For example -- if you had a client site that could use the SlideShowPro Player to present content, that's fine. You cannot however make the player part of a web application where third parties are given the tools to display their content in the player.
Sure. You can find them all here.