Remove Metadata from DOCM using Java. For more information, please follow link: https://kb.groupdocs.com/metadata/java/remove-metadata-from-docm-using-java/

Remove Metadata from DOCM using Java.java

import com.groupdocs.metadata.Metadata;
import com.groupdocs.metadata.core.FileFormat;
import com.groupdocs.metadata.licensing.License;
import com.groupdocs.metadata.search.FallsIntoCategorySpecification;
import com.groupdocs.metadata.search.WithNameSpecification;
import com.groupdocs.metadata.tagging.Tags;

public class RemoveMetadatafromDOCMUsingJava {
    public static void main(String[] args) {

    // Set License to avoid the limitations of Metadata library
    License license = new License();
    license.setLicense("GroupDocs.Metadata.lic");

    Metadata metadata = new Metadata("input.docm");
    if (metadata.getFileFormat() != FileFormat.Unknown 
            && !metadata.getDocumentInfo().isEncrypted()) {
        System.out.println();
        // Remove all mentions of any people contributed in file creation
        // Remove a custom property with the specified name
        int affected = metadata.removeProperties(new FallsIntoCategorySpecification(
                Tags.getPerson()).or(new WithNameSpecification("CustomProperty")));
        System.out.println(String.format("Affected properties: %s", affected));
        metadata.save("output.docm");
    }
  }
}