The certificate is only checked at install time, so if you create a
certificate that expires in 60 days that only prevents that .apk from
being installed after 60 days; any current installs will continue to
work.

And anyway, if someone wants to continue to use your app, they can
just take your .apk, and repackage and sign its contents with their
own certificate.

I would strongly recommend against using multiple certificates, since
if someone has the app installed with one certificate, to install
another version with a different certificate they will need to first
uninstall the current version, deleting all existing data.

On Nov 11, 8:16 am, WampBier <[EMAIL PROTECTED]> wrote:
> Hi All,
>
> I want to sign my application to let a group of tester install it to
> there mobiles.
> Is it possible to create certifications with limited time of use for
> the test people.
>
> Or can I use the existing signing method with a  validity period  from
> 60 days?
>
> I need a new certification, or?
>
> Is it possible to re-install a app with a different certification?
>
> Or should I give them the app with the dev-certification?
>
> Greetings
> WampBier
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