Извините за задержку с ответом. На форум захожу изредка, когда свободное время позволяет.
Вот оригинал текста Айса.
iStock Subscription Download Rates
For both Exclusive and Non-Exclusive artists, iStock.com flat subscription download rates will be replaced. Schedule to be effective November 25, 2016 a subscription ‘price per file’ (PPF) value will be calculated based on the price the customer paid for the subscription divided by the number of files downloaded against the subscription. Your royalty rate will be applied to the PPF.
For example, if a customer had a Signature 100 image subscription for which they paid $299 per month and they downloaded 50 images, we would divide $299 by 50 to give a $5.98 PPF. This would result in a contributor royalty of $1.50, assuming a 25% rate.
If a customer bought an Essentials 100 image subscription for $149 and they downloaded 50 images, the PPF would be $2.98 per file. Assuming a 15% royalty, you would receive $0.45.
This method means you will always earn your royalty percent against a subscription download regardless of the specific subscription a customer purchased or how many downloads they made. If a customer downloads fewer files from their subscription you will earn more due to the higher PPF, with no maximum payments established. We are also implementing a minimum PPF as a safety net for when customers fully utilize their subscription download caps. Those minimums are as follows:
Category Minimum PPF Example royalty % Example royalty payment
Non-Exclusive $0.10 15% $0.02
Exclusive: Essentials/Signature $0.75 35% $0.26
Exclusive: Signature+ $4.15 35% $1.45