diff --git a/docraft/include/docraft/craft/docraft_craft_language_parser.h b/docraft/include/docraft/craft/docraft_craft_language_parser.h
index cbdfb2b..08b0771 100644
--- a/docraft/include/docraft/craft/docraft_craft_language_parser.h
+++ b/docraft/include/docraft/craft/docraft_craft_language_parser.h
@@ -49,6 +49,9 @@ namespace docraft::craft {
 
         ~DocraftCraftLanguageParser() = default;
 
+        DocraftCraftLanguageParser(const DocraftCraftLanguageParser&) = delete;
+        DocraftCraftLanguageParser& operator=(const DocraftCraftLanguageParser&) = delete;
+
         /**
          * @brief Parses craft language source (a single root element) as a string.
          * @param craft_language_source XML source as string.
diff --git a/docraft/include/docraft/loom/craft/docraft_loom_tag_handler_registry.h b/docraft/include/docraft/loom/craft/docraft_loom_tag_handler_registry.h
index 186db06..d4f9eaf 100644
--- a/docraft/include/docraft/loom/craft/docraft_loom_tag_handler_registry.h
+++ b/docraft/include/docraft/loom/craft/docraft_loom_tag_handler_registry.h
@@ -37,6 +37,9 @@ namespace docraft::loom::craft {
     public:
         static DocraftLoomTagHandlerRegistry& instance();
 
+        DocraftLoomTagHandlerRegistry(const DocraftLoomTagHandlerRegistry&) = delete;
+        DocraftLoomTagHandlerRegistry& operator=(const DocraftLoomTagHandlerRegistry&) = delete;
+
         void register_handler(const std::string& tag, std::unique_ptr<IDocraftLoomTagHandler> handler);
 
         /**
diff --git a/docraft/include/docraft/loom/docraft_loom_pdf_creator.h b/docraft/include/docraft/loom/docraft_loom_pdf_creator.h
index 50ca666..dbd6fff 100644
--- a/docraft/include/docraft/loom/docraft_loom_pdf_creator.h
+++ b/docraft/include/docraft/loom/docraft_loom_pdf_creator.h
@@ -24,7 +24,7 @@ namespace docraft::loom {
      * and re-visited by the rendering pass for each physical page. The body is laid out
      * as one continuous flow and then split across pages by DocraftLoomPaginationProcessor.
      */
-    class DocraftLoomPdfCreator
+    class DOCRAFT_LIB DocraftLoomPdfCreator
     {
     public:
         /**
diff --git a/docraft/include/docraft/tools/docraft_validator.h b/docraft/include/docraft/tools/docraft_validator.h
index a938ab9..5621aec 100644
--- a/docraft/include/docraft/tools/docraft_validator.h
+++ b/docraft/include/docraft/tools/docraft_validator.h
@@ -45,7 +45,7 @@ namespace docraft::tools {
      * @brief Aggregated result of DocraftValidator::validate(): every diagnostic found,
      * in the order they were discovered.
      */
-    struct DocraftValidationResult
+    struct DOCRAFT_LIB DocraftValidationResult
     {
         std::vector<DocraftValidationIssue> issues;