To add some pertinent detail, trade secrets are by definition not governed by 
copyright because they are unpublished. This is a double-edged sword; keeping a 
trade secret offers no protection from anyone else discovering the secret by 
legal means, but it also does not expire. If you are good at keeping your 
secret, you have an indefinite monopoly (examples are the formula for Coca-Cola 
as well as the seasonings for KFC chicken) - but anyone can legally duplicate 
it at any time and it is safe for them to do so. However - if a trade secret is 
misappropriated through improper means (like someone under NDA blabbing about 
it), the secret holder becomes legally entitled to certain forms of relief, 
such as a court imposing injunctions against use of the secret by the parties 
it was divulged to, financial damages, and more. In certain jurisdictions, like 
the US, revealing the secret is a crime in and of itself - in the US, it is a 
federal crime.

Most things I have been under NDA for have been so obvious that I don't know 
why they bothered, other than to keep corporate lawyers happy. Particularly for 
software, where it seems that similar ideas percolate to the surface 
independently and nearly simultaneously, keeping one's mouth shut is the surest 
way to keep options open for others. That consideration is of course in 
addition to the plain and simple ethics of sticking to both the letter and the 
spirit of any contract you have signed. If you can't or won't keep your 
promises, don't make them.

--Robert

On Jun 15, 2013, at 6:24, Gregory Casamento <[email protected]> wrote:

> With NDAs there is no such thing as "fair use."   What you're told at WWDC is 
> usually considered trade secret information, particularly when they are 
> giving you inside information about how something is implemented.
> 
> I am not a lawyer, so I am relying on my experience with such matters to 
> discuss this.   NDAs typically are built on what is considered to be 
> proprietary or trade secret information.   They typically don't cover what is 
> considered to be "common knowledge" that is anything you created yourself 
> without referring to the information covered in the NDA, anything someone 
> else created without improper access to the trade secret information or 
> anything that you can prove was commonly known to the general public.
> 
> ​That's why I was warning you.  Typically it's dangerous to assume what is 
> and is not covered without consulting someone​ 
> 
> GC​
> 
> 
> On Sat, Jun 15, 2013 at 6:11 AM, Maxthon Chan <[email protected]> wrote:
> I can fair use, can't I? Their NDA is built on top of copyright.
> 
> Sent from my iPhone
> 
> On 2013年6月15日, at 18:08, Gregory Casamento <[email protected]> wrote:
> 
>> Maxthon,
>> 
>> Just a friendly reminder. :)
>> 
>> Please be very careful about what you disclose here, if you are under NDA.   
>> I don't want a posting here to become any grounds for Apple to cause any 
>> issues for GNUstep.
>> 
>> Gregory
>> 
>> 
>> On Sat, Jun 15, 2013 at 5:57 AM, Maxthon Chan <[email protected]> wrote:
>> I am watching a video session from WWDC 2013 and Apple revealed their way of 
>> implementing tagged pointers: use the sole LSB, 1 for tagged pointer and 0 
>> for normal ones. This is applied across all platforms, i386, amd64, armv7 
>> and armv7s (compatible to armv7a in Coretx-A15 and partly compatible with 
>> AArch64 in 32-bit mode)
>> 
>> Okay technically I am still under NDA so this is pretty much what I can say.
>> 
>> 
>> _______________________________________________
>> Gnustep-dev mailing list
>> [email protected]
>> https://lists.gnu.org/mailman/listinfo/gnustep-dev
>> 
>> 
>> 
>> -- 
>> Gregory Casamento
>> Open Logic Corporation, Principal Consultant
>> yahoo/skype: greg_casamento, aol: gjcasa
>> (240)274-9630 (Cell)
>> http://www.gnustep.org
>> http://heronsperch.blogspot.com
> 
> 
> 
> -- 
> Gregory Casamento
> Open Logic Corporation, Principal Consultant
> yahoo/skype: greg_casamento, aol: gjcasa
> (240)274-9630 (Cell)
> http://www.gnustep.org
> http://heronsperch.blogspot.com
> _______________________________________________
> Gnustep-dev mailing list
> [email protected]
> https://lists.gnu.org/mailman/listinfo/gnustep-dev
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