Not sure what license tag to use

Hi, given the following terms: * MAY be used for commercial applications * MAY be shared freely * MUST NOT be reverse engineered What kind of license tag is supposed to be used? The ideas are: * Redistributable, no modification permitted * Redistributable * Distributable (The package belongs to nonfree.) Thanks for help. -- Miro Hrončok -- Phone: +420777974800 IRC: mhroncok