Proprietary software is an injustice.

If you use a proprietary program or somebody else's web server, you're defenceless. You're putty in the hands of whoever developed that software.

The idea of free software is that users of computing deserve freedom. They deserve in particular to have control over their computing. And proprietary software does not allow users to have control of their computing.

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.

Proprietary software keeps users divided and helpless. Divided because each user is forbidden to redistribute it to others, and helpless because the users can't change it since they don't have the source code. They can't study what it really does. So the proprietary program is a system of unjust power.

One basis for society is that of helping your neighbor -- but in the software world this is piracy. To prevent this, the U.S. is putting in place practices which are like those in the former Soviet Union -- computerized guards, propaganda in favor of licensing, rewards for informing on co-workers, and penalties which make distributing software as serious a crime as armed robbery.