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BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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AirplanesAndRockets.com

Amplifier Solutions Corporation (ASC) - RF Cafe

You've Heard of a Copyright, But How About a Copyleft?

RF Cafe University "Factoids," "Kirt's Cogitations," and "Tech Topics Smorgasbord" are all manifestations of my rantings on various subjects relevant (usually) to the overall RF Cafe theme. All may be accessed on these pages:

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No, this is not a liberal vs. conservative thing, although you might be tempted to think so when considering the terms of each. A copyright, as you know, is legal protection against unauthorized usage or obvious modification of original works, something a right-winger would like because it represents a right to private property. A copyleft, on the other hand, is a left-winger's dream because it permits free distribution of original works with the only restriction being that it and/or derivative works also be declared copyleft material. That explains why evil capitalist companies like IBM copyright and patent everything it creates, and why liberal-dominated companies like Google, Apple, and Facebook allow everything they create to be freely copied. Oh, wait, no they don't - that 'village' concept only applies to everyone else.

I have seen the copyleft logo in a few places when searching for freeware and shareware software and though maybe it was just someone lampooning copyright protection, but upon further research I learn it is a very real form of protection for original works. Here is the distinction, in a nutshell (per Wikipedia entries):

The concept of "copyleft," while not explicitly called that, was first formerly encompassed in the spirit of the 1985 GNU Manifesto, where founder Richard Stallman declared, "GNU is not in the public domain. Everyone will be permitted to modify and redistribute GNU, but no distributor will be allowed to restrict its further redistribution. That is to say, proprietary modifications will not be allowed. I want to make sure that all versions of GNU remain free." Note that copyleft does not place the works in the public domain, which puts no restrictions on usage. The suspected first public declaration of copyleft was by Tiny BASIC's creator Li-Chen Wang. Copyleft, as with copyright, is subject to

Now when you spot a backwards copyright symbol, you know it is for real. As with copyrighted material, copylefted material is also subject to the "Fair Use Act."

Posted May 10, 2016