How do I protect and market my code?

Basically I had a over the summer assignment which I used to develop a piece of software which I guess will sell around 50 - 70 bucks a copy.

To make this clear. The final code is in Java (a requirement).

Now I was think about marketing my little creation however I'm faced with two problem:

1, I need to provide full documentation to the Lecturers. How do I go about preventing them from stealing my code/methodologies used? Would simple copyright be enough?

2. How do I bundle the software? How do I sell it? Should I partner with a publisher or should I just sell the code to a software company? I will need bi-yearly maintenance at least.
How do I protect said software from getting cracked?

How /prog/ has some experience on this already!
Thanks for helping out!

>>36
In the free software movement, we stand for freedom for the users of software. We formulated our views by looking at what freedoms are necessary for a good way of life, and permit useful programs to foster a community of goodwill, cooperation, and collaboration. Our criteria for free software specify the freedoms that a program's users need so that they can cooperate in a community.

Your software is likely to forbid the user of their freedom. It is likely that your software would include usage terms that would control how the user will be permitted to use the software. It is likely that you will not share the source code, thus rendering the user helpless to help them-self and become solely dependent upon you, the master over your software. It is likely that you would forbid users from sharing your software, and thus your software would divide society and forbid society from cooperating.

As a result, you are an enemy of freedom.