English to Russian Law/Patents Printing & Publishing License Agreement

"pay as you print agreement"
Подскажите, пожалуйста, значение выражения в следующем контексте:

2. Publication Date. (a) Publisher agrees to publish its single edition of the Work no later than twelve (12) months from the date of this agreement. This agreement is hereby established as a pay as you print agreement. The agreement can be terminated at any time with a 30 day termination notice from either party.

Заранее спасибо.