diff --git a/pdf2htmlEX.1.in b/pdf2htmlEX.1.in
index aa9cdbc..3850590 100644
--- a/pdf2htmlEX.1.in
+++ b/pdf2htmlEX.1.in
@@ -35,6 +35,9 @@ Specify owner password
 .B -u, --user-password <password>
 Specify user password
 .TP
+.B --no-drm <0|1> (Default: 0)
+Override document DRM settings
+.TP
 .B --dest-dir <dir> (Default: .)
 Specify destination folder
 .TP
diff --git a/src/Param.h b/src/Param.h
index ae80ba7..2d22396 100644
--- a/src/Param.h
+++ b/src/Param.h
@@ -18,7 +18,7 @@ struct Param
     // PDF stuff
     std::string owner_password, user_password;
     std::string input_filename, output_filename;
-    bool no_drm;
+    int no_drm;
 
     // path
     std::string dest_dir, tmp_dir, data_dir;
diff --git a/src/pdf2htmlEX.cc b/src/pdf2htmlEX.cc
index 8d60016..94a4e1d 100644
--- a/src/pdf2htmlEX.cc
+++ b/src/pdf2htmlEX.cc
@@ -64,7 +64,7 @@ void parse_options (int argc, char **argv)
 
         .add("owner-password,o", &param.owner_password, "", "owner password (for encrypted files)", nullptr, true)
         .add("user-password,u", &param.user_password, "", "user password (for encrypted files)", nullptr, true)
-        .add("no-drm", &param.no_drm, false, "override document DRM settings")
+        .add("no-drm", &param.no_drm, 0, "override document DRM settings")
 
         .add("dest-dir", &param.dest_dir, ".", "specify destination directory")
         .add("data-dir", &param.data_dir, PDF2HTMLEX_DATA_PATH, "specify data directory")
@@ -193,7 +193,7 @@ int main(int argc, char **argv)
 
         // check for copy permission
         if (!doc->okToCopy()) {
-            if (!param.no_drm) {
+            if (param.no_drm == 0) {
                 throw "Copying of text from this document is not allowed.";
             }
             cerr << "Document has copy-protection bit set." << endl;