we are currently signing PDF documents with ECDSA signatures through custom sofware (= that makes use of iText). When I open a signed document on a 'consumer' version of Adobe Reader all signatures are valid. When I open the same document on an 'enterprise' version of Adobe Reader the signature is invalid (= the document has been altered). Documents signed with RSA do not have issues.
We finally found the registry setting that is causing this: HKEY_CURRENT_USER\SOFTWARE\Adobe\Acrobat Reader\DC\Security\bEnableCryptoComplyLibrary. When it is set to 0 on an 'enterprise' system, there there is no issue.
I did a search on that bEnableCryptoComplyLibrary setting but was not able to find any information about it. Can anyone help me with this? What is the implication of disabling/enabling it?