Hi,
When you open your form in LC Designer, go to File / Form Properties. Click on the PDF Security tab and tick the Permissions checkbox. This will allow you to set the restrictions on the people using the form in Acrobat.
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In addition the next time you save the file in LC Designer it will prompt you for a password for the file. The users will not have to input a password when opening the file in Acrobat; but if a user tries to open the file in LC Designer they will be asked for the password.
It is a good way to protect your code, without affecting the user's experience in Acrobat.
It goes without saying, but note down the password, becuase if you forget it you will also be locked out of your form.
Good luck,
Niall