Such a document is either a free software license or the release of the source code into the public domain.

Such an agreement is made separately from the free software license.

For quite some time Geant4 did not have a clearly defined software license.

I paid for the software license, so I want to be able to use it.

These implementations are provided under a variety of software licenses.

All of the designs produced by the project are released under a free software license.

A fourth release under a new free software license occurred in 2002.

That software licenses cost more when remote access is allowed?

I don't imagine software licenses are effected much by remote access if at all.

There is no need to purchase or upgrade a software license.