can the opentype features work without the digital siganature?

[KTsee]

Hi!
I just begin to use Fontlab to generate my opentype font and add a ligature feature to test.
But after I generate the font(*.ttf), because I don't add the Digital Sig, the icon is wrong.
I wanna know in this condition, can my ligature work well ? Must I add the DISG?
I just test the font in InDesign but it can not show me the ligature ...
Can someone help me, pls ?

Regards,

KT

[Alex Petrov (FontLab)]

The presence of DSIG does affect the icon but not features. So your ligatures should work I suppose.

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