Unsure if Shakespeare is now porn.
Will jerk to twelfth night and report back tomorrow if paper cuts aren't too severe.
Actual questions: is a mental image caused by a book an image? How will they define image? What is pornograph-y/ic? Is sex ed / biology exempt?
10% of gross revenue would be better.
Profits can always be turned to "losses" with clever accounting and shell corps (see Hollywood accounting)
And net values can always be offset by deductions and other costs.
You can't fuck with gross.