It means you re exercising your time-honored right of jury nullification. No, you haven t nullified the law. The law is still there, chiseled deep into the big stone tablet in the hollowed halls of judicialness. It will be used again in other courtrooms in other trials against other peaceful, nonviolent fellow citizens. All you did was nullify that particular application of that particular law in that particular case.
Jury nullification is just one additional check against the checkered power of the power czars.
In Ye Merrye Olde Colonial Tymes, a publisher named Zenger zapped some zingers at Ye Royale Guvna of Neu Yawk. Worst of all, the zings were true. His Royalness hauled the scribbler into court for sedition. The jury did a Politically Incorrect Thing. Even though they knew Zenger had broken the law, they decided the law was, well, stupid.