If you are using LiveCycle RightsManagement ES2 SP2 (126.96.36.199) to apply policies to documents, and you have selected the option “Encrypt all document contents except metadata” in the policy, you will notice that the metadata is encrypted by mistake.
The option to omit the metadata from encryption can be configured when creating the policy as described below (Unchangeable Advanced Settings > Document Restrictions):
This is a product issue in LiveCycle ES2 SP2, and is fixed in later versions.
There is a patch available for LiveCycle ES2 SP2. You should contact the enterprise support team if you require this patch.