Get Adobe Extension Signing Certificate

Hello,
I am a Creative Cloud member and have been working on developing an Extension for InDesign and InCopy versions CS 5.x and above. We are intending to extend the support for other Adobe products also at a later date. Until now, I have been signing the zxp file with a certificate that I created via ExtensionBuilder, but now, we are getting ready to ship the extension to some of our prospective customers as a beta version for some feedback. And for that I need to get the extension signed with a certificate by a recognized authority, so that user does not get an error looking message while installing the extension.
I did look around a little on Adobe forums and google but could not get a concrete list or steps to do so. What I need to know is:
1. what all kinds of certificates are available,
2. how to choose which one I should go for,
3. how to get the certificate,
4. certificate's validity (number of uses / time period) and
5. the cost involved.
I believe the process of signing the extension will be the same (I am using ant script to build and sign the zxp); please correct me if I am wrong.
Any help is much appreciated.
- Swati.

I was kind of stuck on this one. We need to dispatch the extension to the customers for feedback. I have been searching online for a clue but no luck.
Any help will be much appreciated.
Does Adobe give out extension signing certificate? If not, any preferences?

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I'm having problems with my current certificate issuer (Globalsign) as they decided not to support developers any more and have to change to another company; this means my certificate can't be renewed.
My knowledge about certificates is very limited, please can you help me?
Extensions released with the old certificate can still be installed after it expires ? If, yes, will the user become a warning or something else ?
Some users reported ( before the related certificate issue) that they got "invalid signature" warnings (mainly with CC) and they had to disable internet access in the extension manager to get it installed, this makes me think about the whole system.
Is really a certificate needed ? Why not just allow us to input our contact details and let the user decide to trust or not?
Just paying a yearly fee only to guarantee that our names appear at the installation seems not to be very reliable. May be Adobe can allow extension builder developers an easier way to sign our extensions.
Btw, I assume I'm not the only one signing the extensions, right ?
Thanks for any help.

I was kind of stuck on this one. We need to dispatch the extension to the customers for feedback. I have been searching online for a clue but no luck.
Any help will be much appreciated.
Does Adobe give out extension signing certificate? If not, any preferences?

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All of them. I'm talking about the certificate used to verify the security of the connection to Adobe's websites. It's probably more for tin foil hat types like me, but since it's sort of become a standard protocol and since it's not hard to spoof websites, I like to check those things out and make sure they're set up in my browser and email apps.
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Hi hdbrew,
"extension doesn't contain a valid signature" is a warning message that I've got in the past when Adobe Extension Manager (AEM) wasn't up to date - so you might check whether you've the latest version here: https://creative.adobe.com/en/products/extension-manager.
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