What most people are talking about when they talk about these copyright issues are the copyrighting and/or trademarking of artistic creations.
What's rarely brought up is the fact that there's a very analogous system in the world, too. For scientific creations, there's such a thing as patents. Patents are basically copyright for scientific inventions, as opposed to artistic inventions.
Now, if we compare patents to copyright, the vast disparity in protection length becomes obvious. In most countries, patents protect the exclusivity of scientific inventions for 15-25 years.
Artistic inventions are protected for *95* years. That is to say, 4-5 times longer.
Why? What makes them worth so much longer a protection than scientific inventions get?
The purpose of exclusivity expiring eventually (that is, not being forever) is to release the invented concept into the public domain so that the general public can eventually benefit from making use of the invention in whatever way society feels fit.
However, this right of the general public is by and large being denied at present when it comes to artistic inventions. Copyright terms are being extended and extended by Disney and other megacorporations because they don't want their big brands to become public property.
Imagine if Alexander Bell would have retained exclusive rights to the telephone for 95 years. The patent was issued in 1876. That means the telephone would have become public domain in 1971! The steam turbine would have become available to the general public in 1979 and barbed wire in 1982. The roller coaster and the diesel engine would have expired in 1993.
More importantly, what things would still be patented? We'd be waiting for the zipper to expire in 2012. Aerosol cans would become available in 2022, electric shavers in 2023. Radar wouldn't fall out of protection until 2030.
Imagine how much slower technology would have advanced if things like *zippers* would have to be licensed in order to be used in clothes.
Excessively long protection times directly harm the public, whether it be in the field of our scientific development or in the field of our artistic development.