explicit permission

They have explicit permission to send you promotional e-mail messages.

By the mid-16th century no peasant could leave the land without explicit permission of the lord.

This is then used to obtain either an implicit or an explicit permission to study at a university.

The author has given explicit permission for it to appear here.

In reserved forests, explicit permission is required for such activities.

Emigration and any travel abroad were not allowed without an explicit permission from the government.

No one was allowed in her office without her explicit permission.

But many online businesses claim you gave explicit permission to receive them.

Never post a picture or video of or with someone else unless you have their explicit permission.

You have to give it explicit permission each and every time.