There's two definitions of stealing that tend to go around:LilithSlave said:I hate to have to make the obvious statement that piracy is not stealing yet again. But piracy is not stealing.
#1: Taking something that belongs to someone (depriving them of it) without permission.
#2: Benefiting financially or obtaining a possession by employing an illegal act.
The first definition is the classic, strict definition, and the second one is the vernacular. For example, some people will say you've stolen someone's money if you sell them a product, but never actually deliver it. In the vernacular, that's true. That's 'stealing', but in the strictest sense, that's actually not stealing. It's fraud; a distinct and separate concept.
Saying it's not stealing does not mean you're admitting it's A-O-K, however. So, copyright supporters really should relax about this. You can still condemn copying if you choose to do so, without trying to abuse the english language to suit your argument.
The only exception is if you're using the informal logical fallacy of 'equivocation', or the 'fallacy of the four terms' as a basis for your argument. Consider the syllogism:
"Copyright infringement is stealing. Stealing is wrong. Therefore, copyright infringement is wrong."
In that example, you could be using two completely separate definitions for the word 'stealing'. Everyone agrees that definition #1 of stealing is morally wrong, but that definition is not the same as definition #2, which is debatable and depends on exactly which kind of 'stealing', so this syllogism becomes a fallacy. Consider the similar syllogism:
"A feather is light. What is light cannot be dark. Therefore, a feather cannot be dark."
This kind of fallacious reasoning is actually very persuasive if you don't bother thinking about it, or you don't understand that one word can have multiple definitions, so it's in the interests of the intellectually dishonest to pursue this association. For example, when they claim the false dichotomy of "if you support copyright infringement, then to be consistent you must support walking into a McDonalds and stealing all their burgers."