If you are trying to ReaderExtend a PDF in LCRE 7 either in the web interface, or using the API, you may receive the following error:
Error 473: Credential permissions are invalid...
This error is related to the credential permissions provided with LCRE. There is a .pfx credential file which must be configured with LCRE to allow you to ReaderExtend documents. This credential is essentially used to certify the PDF when applying the rights, to prevent unauthorized changes to the PDF once distributed. You need to provide an alias/password for this credential file when installing LCRE.
Often the wrong alias/password combination is used for this credential when installing LCRE.
Make sure you use the alias/password provided with the credential file.
Other possible causes:
1) using the wrong JDK or using JDK 1.4.2_10 which is not supported
2) ares-roles.properties, ares-users.properties not correctly mapping users in