403. Form of licence.

No special form or words is or are required for the grant of a licence1 under a patent, and licences under hand, parol licences2, implied licences3 and licences by estoppel4 are well recognised. A licence need not be in writing for notice of it to be registered5.

The forms of licence agreements are well established6. An agreement to grant a licence, if the parties act on it, is treated in equity as a licence