Also, because schools must teach the spirit of goodwill, the habit of helping others around you, every class should have this rule: students, if you bring software to class you may not keep it for yourself. ↗
Proprietary software tends to have malicious features. The point is with a proprietary program, when the users don't have the source code, we can never tell. So you must consider every proprietary program as potential malware. ↗