New to Java: Forcing Open development? Can I choose?

Dear brewers,
I am only just delving into the world of java. Though aware and savvy of the things that make the world of computing tick, I cannot claim to have vast proramming experience.
I have been exposed to C and C++ and the frustrations that come with them so the Java concept seems welcome and refreshing and your tutorials promise to serve the purpose of dragging one swiftly into the Java cup.
However, browsing through all the documentation, I have noticed that that Java seeks only to facilitate portability of applications and not preserve the choice of a developer to restrict an application to a particular platform (system).
I understand that the JavaVM is 'the' java platform but I would also like to know if there exist any measures, besides the unreliable dependency on copyright warnings to prevent piracy of software or the running of an application on a system other than that for which the developer intended.
If, for example, a cellphone company developed an application that allowed its users to play movies on their java-enabled units, how would they proceed to protect their application and as a result retain their competitiveness?
If my analysis of the online Java documentation is sound, all competitors would have to do is let "their" users know that such an application exists and their users would then proceed to obtain a copy of the software which is "guaranteed" to run on any java enabled system!
I realise that my question may have already been answered and if this is the case, kindly provide me with links to documentation on this question and other related topics.I would greatly appreciate your response.

Your question implies that the way to enforce license restrictions is to write in a platform-dependent language, or at least make the software product available only in a platform-dependent format.
I suppose you can do that, but it sounds like a doubtful strategy.
o What if the definition of the protected platform does not coincide with the hardware platform. Example: Cell phone developer uses a commodity chip like the ARM?
o What if the cell phone supplier wants to meter the use, allowing the user to only view movies as long as jis monthly bill is paid?
The answer is to consciously build these into the application design.
This is NOT meant as an endorsement of the java "write one run anywhere" mantra.

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