Free of charge unlimited evaluation with the sole restriction that licence keys produced with an unregistered copy of Sheriff have a maximum lifespan of 30 days. So you can evaluate the full Sheriff SDK for as long as you like prior to purchase
US$1,000 for the first product, US$500 for addtional products
You can order an additional Product Serial Number at any time but you must have already purchased a First Serial Number.
You can protect an unlimited number of copies of a single product with one Serial Number, including different versions of the same product, but you need an additional Serial Number for each additional product.
For example, you publish two products: SuperDog Version 1.0 - for the owners of kennels - and SuperCat Version 1.0 - for the owners of catteries. If you want to protect both SuperDog and SuperCat with Sheriff you will need to purchase two Serial Numbers; the first Serial Number will cost you $1,000 and the second $500. So your total outlay on protecting both your products will be $1,500.