I believe that knowledge is global and free
That is essentially academia in a nutshell. ;-)
I believe – strongly – that anything that runs counter this freedom also fundamentally runs counter academia, and humanity’s best interest (or, economically, the country’s best interest).
From a more legal perspective, (University) teachers are paid for teaching, not for the knowledge they posses. So you are fine, as long as you don’t disseminate copyrighted material.
This used to be different, when much knowledge was coveted, closely guarded and only handed down from teachers to their apprentices, under an agreement of privacy (see for instance the Hippocratic Oath, which regulates this, among other things).
Nowadays, knowledge cannot generally be privatised. Instead, we have the concepts of copyright and patents, but neither prevents the dissemination of knowledge. Exceptions only exist in certain circumstances, e.g. for a method that is currently being developed, where you may be asked to sign a non-disclosure agreement; for classified governmental documents, dissemination of which may make you liable to prosecution, and the publication of know-how that falls under weapons regulations.