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I think it is wrong because it should be in passive voice, so "All rights are reserved" is correct. Is it that people are too lazy to make a change even they realize there is a mistake?

NanningYouth
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Do you also think when someone wishes you "Happy birthday!" it's also because they're too "lazy" to say the full sentence, "I hope you have a happy birthday"?

I'm sure your own native language has many "standard phrases", which are well-known abbreviations of longer expressions. "All Rights Reserved" is one such in English, or (as Tᴚoɯɐuo mentions in his comment) "Keep Away From Children", or "No Smoking", "Fire Hazard", "Batteries Not Included", "Some Assembly Required", "This End Up", "Handle With Care", or even the ubiquitous "Good Morning".

As with any language, the basic grammar is just there to get you started. Once you learn that, you need to learn how English is actually used by native speakers.

Andrew
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  • but there are some examples of errors being accepted as normal in English, such as "Long time no see". I think when people choose to abbreviate, they want to save time and trouble, but "All rights are reserved" and "All rights reserved" do not make much difference. – NanningYouth Nov 07 '17 at 02:07
  • @NanningYouth there are perhaps thousands of such phrases in English. You might as well get used to them. – Andrew Nov 07 '17 at 05:39